{
"document": {
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE"
}
},
"lang": "en",
"notes": [
{
"category": "legal_disclaimer",
"text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
}
],
"publisher": {
"category": "coordinator",
"contact_details": "cert@ncsc.nl",
"name": "National Cyber Security Centre",
"namespace": "https://www.ncsc.nl/"
},
"title": "CVE-2026-30858",
"tracking": {
"current_release_date": "2026-03-25T21:45:26.222111Z",
"generator": {
"date": "2026-02-17T15:00:00Z",
"engine": {
"name": "V.E.L.M.A",
"version": "1.7"
}
},
"id": "CVE-2026-30858",
"initial_release_date": "2026-03-07T00:12:44.417720Z",
"revision_history": [
{
"date": "2026-03-07T00:12:44.417720Z",
"number": "1",
"summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1)."
},
{
"date": "2026-03-07T00:12:50.919874Z",
"number": "2",
"summary": "NCSC Score created."
},
{
"date": "2026-03-07T00:39:53.843280Z",
"number": "3",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
},
{
"date": "2026-03-07T00:40:04.549031Z",
"number": "4",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-07T17:25:16.824332Z",
"number": "5",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)."
},
{
"date": "2026-03-07T17:25:19.279379Z",
"number": "6",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-07T17:38:53.050392Z",
"number": "7",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)."
},
{
"date": "2026-03-07T17:39:01.688784Z",
"number": "8",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-08T14:48:52.281790Z",
"number": "9",
"summary": "Source created.| CVE status created. (valid)| EPSS created."
},
{
"date": "2026-03-08T14:49:05.178634Z",
"number": "10",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-09T13:39:51.080222Z",
"number": "11",
"summary": "References created (1)."
},
{
"date": "2026-03-09T18:12:49.798278Z",
"number": "12",
"summary": "Products created (1).| Products removed (1).| References created (1)."
},
{
"date": "2026-03-09T18:12:51.785426Z",
"number": "13",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-09T18:27:55.214933Z",
"number": "14",
"summary": "Products created (1).| Product Identifiers created (1).| Exploits created (1)."
},
{
"date": "2026-03-09T18:27:57.512192Z",
"number": "15",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-09T18:39:00.494937Z",
"number": "16",
"summary": "Unknown change."
},
{
"date": "2026-03-19T15:29:12.440584Z",
"number": "17",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)."
},
{
"date": "2026-03-19T15:29:14.789247Z",
"number": "18",
"summary": "NCSC Score updated."
},
{
"date": "2026-03-20T09:33:49.251323Z",
"number": "19",
"summary": "Source connected.| CVE status created. (valid)| EPSS created."
},
{
"date": "2026-03-25T18:15:34.870035Z",
"number": "20",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (1)."
},
{
"date": "2026-03-25T21:45:19.889744Z",
"number": "21",
"summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (21).| References created (3).| CWES updated (1)."
},
{
"date": "2026-03-25T21:45:23.764196Z",
"number": "22",
"summary": "NCSC Score updated."
}
],
"status": "interim",
"version": "22"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/<0.3.0",
"product": {
"name": "vers:unknown/<0.3.0",
"product_id": "CSAFPID-5770072"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/>=0|<0.3.0",
"product": {
"name": "vers:unknown/>=0|<0.3.0",
"product_id": "CSAFPID-5771904"
}
}
],
"category": "product_name",
"name": "WeKnora"
},
{
"branches": [
{
"category": "product_version_range",
"name": "vers:unknown/<0.3.0",
"product": {
"name": "vers:unknown/<0.3.0",
"product_id": "CSAFPID-5772001",
"product_identification_helper": {
"cpe": "cpe:2.3:a:tencent:weknora:*:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.1.0",
"product": {
"name": "vers:unknown/v0.1.0",
"product_id": "CSAFPID-5364807"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.1.1",
"product": {
"name": "vers:unknown/v0.1.1",
"product_id": "CSAFPID-5364808"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.1.2",
"product": {
"name": "vers:unknown/v0.1.2",
"product_id": "CSAFPID-5364809"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.1.3",
"product": {
"name": "vers:unknown/v0.1.3",
"product_id": "CSAFPID-5364810"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.1.5",
"product": {
"name": "vers:unknown/v0.1.5",
"product_id": "CSAFPID-5364811"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.1.6",
"product": {
"name": "vers:unknown/v0.1.6",
"product_id": "CSAFPID-5364812"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.0",
"product": {
"name": "vers:unknown/v0.2.0",
"product_id": "CSAFPID-5364813"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.1",
"product": {
"name": "vers:unknown/v0.2.1",
"product_id": "CSAFPID-5364814"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.10",
"product": {
"name": "vers:unknown/v0.2.10",
"product_id": "CSAFPID-5909251"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.11",
"product": {
"name": "vers:unknown/v0.2.11",
"product_id": "CSAFPID-5909252"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.12",
"product": {
"name": "vers:unknown/v0.2.12",
"product_id": "CSAFPID-5909258"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.13",
"product": {
"name": "vers:unknown/v0.2.13",
"product_id": "CSAFPID-5909259"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.14",
"product": {
"name": "vers:unknown/v0.2.14",
"product_id": "CSAFPID-5909260"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.2",
"product": {
"name": "vers:unknown/v0.2.2",
"product_id": "CSAFPID-5364815"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.3",
"product": {
"name": "vers:unknown/v0.2.3",
"product_id": "CSAFPID-5364816"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.4",
"product": {
"name": "vers:unknown/v0.2.4",
"product_id": "CSAFPID-5364817"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.5",
"product": {
"name": "vers:unknown/v0.2.5",
"product_id": "CSAFPID-5909253"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.6",
"product": {
"name": "vers:unknown/v0.2.6",
"product_id": "CSAFPID-5909254"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.7",
"product": {
"name": "vers:unknown/v0.2.7",
"product_id": "CSAFPID-5909255"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.8",
"product": {
"name": "vers:unknown/v0.2.8",
"product_id": "CSAFPID-5909256"
}
},
{
"category": "product_version_range",
"name": "vers:unknown/v0.2.9",
"product": {
"name": "vers:unknown/v0.2.9",
"product_id": "CSAFPID-5909257"
}
}
],
"category": "product_name",
"name": "weknora"
}
],
"category": "vendor",
"name": "Tencent"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-30858",
"cwe": {
"id": "CWE-918",
"name": "Server-Side Request Forgery (SSRF)"
},
"notes": [
{
"category": "description",
"text": "### Summary\n\nA DNS rebinding vulnerability in the `web_fetch` tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data.\n\n### Details\n\nThe vulnerability exists because the `web_fetch` tool lacks complete DNS pinning. The application performs URL validation only once via `validateParams()`, but the URL is then passed unchanged to the `fetchHTMLContent()` function, which eventually reaches `fetchWithChromedp()`. The headless browser (Chromedp) resolves the hostname independently without DNS pinning, allowing a time-of-check-time-of-use (TOCTOU) attack.\n\n**Validation phase (first DNS resolution):**\n```go\nif err := t.validateParams(p); err != nil {\n // Returns error for private IPs\n results[index] = &webFetchItemResult{\n err: err,\n // ...\n }\n return\n}\n```\n\n**Execution phase (second DNS resolution):**\nThe original URL (not the resolved IP) is passed through the execution chain:\n```go\noutput, data, err := t.executeFetch(ctx, p)\n// Calls fetchHTMLContent(ctx, targetURL) where targetURL is the original hostname\n```\n\n**Chromedp execution (vulnerable DNS resolution):**\n```go\nfunc (t *WebFetchTool) fetchWithChromedp(ctx context.Context, targetURL string) (string, error) {\n // targetURL is not DNS-pinned; browser resolves it independently\n err := chromedp.Run(ctx,\n chromedp.Navigate(targetURL), // Third DNS lookup occurs here\n chromedp.WaitReady(\"body\", chromedp.ByQuery),\n chromedp.OuterHTML(\"html\", &html),\n )\n}\n```\n\nThe attacker controls a domain that can be configured to return different DNS responses to different queries, enabling them to bypass the initial private IP check and access restricted resources during the actual fetch.\n\n### PoC\n\n**Setup:**\n1. Deploy the DNS rebinding server (attached Python file) with the following systemd configuration:\n\n```systemd\n[Unit]\nDescription=DNS Rebinding Test Server\nAfter=network.target\n\n[Service]\nType=simple\nUser=root\nWorkingDirectory=/root/Repos/dns-rebinding-server\nExecStart=/root/.proto/shims/python -u /root/Repos/dns-rebinding-server/server.py --token aleister1102 --domain aleister.ninja --port 53 --global-tracking --ip1 1.1.1.1 --ip2 0.0.0.0 --first-response-count 1 --reset-time 0\nRestart=always\nRestartSec=3\n\n[Install]\nWantedBy=multi-user.target\n ```\n \n This configures the DNS server to:\n - Return `1.1.1.1` (a public IP) for the first DNS query\n - Return `127.0.0.1` (localhost) for all subsequent queries\n - TTL is set to 0 to prevent caching\n \n The sequence can also be reset via reset.domain.com (reset to 1.1.1.1).\n \n > Note: We may need to reset the sequence as the TOCTOU attack is not truly reliable and needs to be triggered multiple times.\n\n2. Set up a simple HTTP server on the localhost of the backend service:\n\n ```bash\n python -m http.server 8888\n ```\n\n3. Configure the malicious domain to point to the DNS rebinding server\n\n**Execution:**\n1. Enable web search on an agent.\n2. Prompt the agent to fetch content from the attacker-controlled domain (e.g., `http://attacker.example.com`)\n3. The sequence of events:\n - **First DNS query** (validation phase): `attacker.example.com` → `1.1.1.1` ✓ Passes validation\n - **Second DNS query** (execution phase): `attacker.example.com` → `127.0.0.1` ✗ Bypass achieved\n - The `web_fetch` tool successfully connects to `127.0.0.1:8080` and returns the local server's content\n\n**Result:**\nThe attacker gains access to the local HTTP server and can read its content, demonstrating that internal resources are now accessible through the rebinding attack.\n\n![\"image\"](\"https://github.com/user-attachments/assets/897e8494-f39e-49ce-a02a-5832bb84a73f\")
\n\nPoC video:\n\nhttps://github.com/user-attachments/assets/68daaa87-4b9b-4b6e-b6f6-ee123f5fcda9\n\n### Impact\n**Vulnerability Type:** DNS Rebinding / Server-Side Request Forgery (SSRF)\n\n**Who is impacted:**\n- Any user or agent with web search capability can exploit this vulnerability\n- The vulnerability grants access to internal services, configuration files, metadata services, and other sensitive resources normally restricted to the internal network\n- In cloud environments, this could allow access to metadata endpoints (e.g., AWS IMDSv1) to obtain credentials and secrets\\",
"title": "github - https://github.com/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"category": "description",
"text": "### Summary\n\nA DNS rebinding vulnerability in the `web_fetch` tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data.\n\n### Details\n\nThe vulnerability exists because the `web_fetch` tool lacks complete DNS pinning. The application performs URL validation only once via `validateParams()`, but the URL is then passed unchanged to the `fetchHTMLContent()` function, which eventually reaches `fetchWithChromedp()`. The headless browser (Chromedp) resolves the hostname independently without DNS pinning, allowing a time-of-check-time-of-use (TOCTOU) attack.\n\n**Validation phase (first DNS resolution):**\n```go\nif err := t.validateParams(p); err != nil {\n // Returns error for private IPs\n results[index] = &webFetchItemResult{\n err: err,\n // ...\n }\n return\n}\n```\n\n**Execution phase (second DNS resolution):**\nThe original URL (not the resolved IP) is passed through the execution chain:\n```go\noutput, data, err := t.executeFetch(ctx, p)\n// Calls fetchHTMLContent(ctx, targetURL) where targetURL is the original hostname\n```\n\n**Chromedp execution (vulnerable DNS resolution):**\n```go\nfunc (t *WebFetchTool) fetchWithChromedp(ctx context.Context, targetURL string) (string, error) {\n // targetURL is not DNS-pinned; browser resolves it independently\n err := chromedp.Run(ctx,\n chromedp.Navigate(targetURL), // Third DNS lookup occurs here\n chromedp.WaitReady(\"body\", chromedp.ByQuery),\n chromedp.OuterHTML(\"html\", &html),\n )\n}\n```\n\nThe attacker controls a domain that can be configured to return different DNS responses to different queries, enabling them to bypass the initial private IP check and access restricted resources during the actual fetch.\n\n### PoC\n\n**Setup:**\n1. Deploy the DNS rebinding server (attached Python file) with the following systemd configuration:\n\n```systemd\n[Unit]\nDescription=DNS Rebinding Test Server\nAfter=network.target\n\n[Service]\nType=simple\nUser=root\nWorkingDirectory=/root/Repos/dns-rebinding-server\nExecStart=/root/.proto/shims/python -u /root/Repos/dns-rebinding-server/server.py --token aleister1102 --domain aleister.ninja --port 53 --global-tracking --ip1 1.1.1.1 --ip2 0.0.0.0 --first-response-count 1 --reset-time 0\nRestart=always\nRestartSec=3\n\n[Install]\nWantedBy=multi-user.target\n ```\n \n This configures the DNS server to:\n - Return `1.1.1.1` (a public IP) for the first DNS query\n - Return `127.0.0.1` (localhost) for all subsequent queries\n - TTL is set to 0 to prevent caching\n \n The sequence can also be reset via reset.domain.com (reset to 1.1.1.1).\n \n > Note: We may need to reset the sequence as the TOCTOU attack is not truly reliable and needs to be triggered multiple times.\n\n2. Set up a simple HTTP server on the localhost of the backend service:\n\n ```bash\n python -m http.server 8888\n ```\n\n3. Configure the malicious domain to point to the DNS rebinding server\n\n**Execution:**\n1. Enable web search on an agent.\n2. Prompt the agent to fetch content from the attacker-controlled domain (e.g., `http://attacker.example.com`)\n3. The sequence of events:\n - **First DNS query** (validation phase): `attacker.example.com` → `1.1.1.1` ✓ Passes validation\n - **Second DNS query** (execution phase): `attacker.example.com` → `127.0.0.1` ✗ Bypass achieved\n - The `web_fetch` tool successfully connects to `127.0.0.1:8080` and returns the local server's content\n\n**Result:**\nThe attacker gains access to the local HTTP server and can read its content, demonstrating that internal resources are now accessible through the rebinding attack.\n\n\n\nPoC video:\n\nhttps://github.com/user-attachments/assets/68daaa87-4b9b-4b6e-b6f6-ee123f5fcda9\n\n### Impact\n**Vulnerability Type:** DNS Rebinding / Server-Side Request Forgery (SSRF)\n\n**Who is impacted:**\n- Any user or agent with web search capability can exploit this vulnerability\n- The vulnerability grants access to internal services, configuration files, metadata services, and other sensitive resources normally restricted to the internal network\n- In cloud environments, this could allow access to metadata endpoints (e.g., AWS IMDSv1) to obtain credentials and secrets\\",
"title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-h6gw-8f77-mmmp.json?alt=media"
},
{
"category": "description",
"text": "WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a DNS rebinding vulnerability in the web_fetch tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data. This issue has been patched in version 0.3.0.",
"title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-30858"
},
{
"category": "description",
"text": "WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a DNS rebinding vulnerability in the web_fetch tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data. This issue has been patched in version 0.3.0.",
"title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-30858"
},
{
"category": "description",
"text": "### Summary\n\nA DNS rebinding vulnerability in the `web_fetch` tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data.\n\n### Details\n\nThe vulnerability exists because the `web_fetch` tool lacks complete DNS pinning. The application performs URL validation only once via `validateParams()`, but the URL is then passed unchanged to the `fetchHTMLContent()` function, which eventually reaches `fetchWithChromedp()`. The headless browser (Chromedp) resolves the hostname independently without DNS pinning, allowing a time-of-check-time-of-use (TOCTOU) attack.\n\n**Validation phase (first DNS resolution):**\n```go\nif err := t.validateParams(p); err != nil {\n // Returns error for private IPs\n results[index] = &webFetchItemResult{\n err: err,\n // ...\n }\n return\n}\n```\n\n**Execution phase (second DNS resolution):**\nThe original URL (not the resolved IP) is passed through the execution chain:\n```go\noutput, data, err := t.executeFetch(ctx, p)\n// Calls fetchHTMLContent(ctx, targetURL) where targetURL is the original hostname\n```\n\n**Chromedp execution (vulnerable DNS resolution):**\n```go\nfunc (t *WebFetchTool) fetchWithChromedp(ctx context.Context, targetURL string) (string, error) {\n // targetURL is not DNS-pinned; browser resolves it independently\n err := chromedp.Run(ctx,\n chromedp.Navigate(targetURL), // Third DNS lookup occurs here\n chromedp.WaitReady(\"body\", chromedp.ByQuery),\n chromedp.OuterHTML(\"html\", &html),\n )\n}\n```\n\nThe attacker controls a domain that can be configured to return different DNS responses to different queries, enabling them to bypass the initial private IP check and access restricted resources during the actual fetch.\n\n### PoC\n\n**Setup:**\n1. Deploy the DNS rebinding server (attached Python file) with the following systemd configuration:\n\n```systemd\n[Unit]\nDescription=DNS Rebinding Test Server\nAfter=network.target\n\n[Service]\nType=simple\nUser=root\nWorkingDirectory=/root/Repos/dns-rebinding-server\nExecStart=/root/.proto/shims/python -u /root/Repos/dns-rebinding-server/server.py --token aleister1102 --domain aleister.ninja --port 53 --global-tracking --ip1 1.1.1.1 --ip2 0.0.0.0 --first-response-count 1 --reset-time 0\nRestart=always\nRestartSec=3\n\n[Install]\nWantedBy=multi-user.target\n ```\n \n This configures the DNS server to:\n - Return `1.1.1.1` (a public IP) for the first DNS query\n - Return `127.0.0.1` (localhost) for all subsequent queries\n - TTL is set to 0 to prevent caching\n \n The sequence can also be reset via reset.domain.com (reset to 1.1.1.1).\n \n > Note: We may need to reset the sequence as the TOCTOU attack is not truly reliable and needs to be triggered multiple times.\n\n2. Set up a simple HTTP server on the localhost of the backend service:\n\n ```bash\n python -m http.server 8888\n ```\n\n3. Configure the malicious domain to point to the DNS rebinding server\n\n**Execution:**\n1. Enable web search on an agent.\n2. Prompt the agent to fetch content from the attacker-controlled domain (e.g., `http://attacker.example.com`)\n3. The sequence of events:\n - **First DNS query** (validation phase): `attacker.example.com` → `1.1.1.1` ✓ Passes validation\n - **Second DNS query** (execution phase): `attacker.example.com` → `127.0.0.1` ✗ Bypass achieved\n - The `web_fetch` tool successfully connects to `127.0.0.1:8080` and returns the local server's content\n\n**Result:**\nThe attacker gains access to the local HTTP server and can read its content, demonstrating that internal resources are now accessible through the rebinding attack.\n\n\n\nPoC video:\n\nhttps://github.com/user-attachments/assets/68daaa87-4b9b-4b6e-b6f6-ee123f5fcda9\n\n### Impact\n**Vulnerability Type:** DNS Rebinding / Server-Side Request Forgery (SSRF)\n\n**Who is impacted:**\n- Any user or agent with web search capability can exploit this vulnerability\n- The vulnerability grants access to internal services, configuration files, metadata services, and other sensitive resources normally restricted to the internal network\n- In cloud environments, this could allow access to metadata endpoints (e.g., AWS IMDSv1) to obtain credentials and secrets\\",
"title": "github - https://api.github.com/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"category": "description",
"text": "WeKnora has DNS Rebinding Vulnerability in web_fetch Tool that Allows SSRF to Internal Resources in github.com/Tencent/WeKnora",
"title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4643.json?alt=media"
},
{
"category": "description",
"text": "WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.3.0, a DNS rebinding vulnerability in the web_fetch tool allows an unauthenticated attacker to bypass URL validation and access internal resources on the server, including private IP addresses (e.g., 127.0.0.1, 192.168.x.x). By crafting a malicious domain that resolves to a public IP during validation and subsequently resolves to a private IP during execution, an attacker can access sensitive local services and potentially exfiltrate data. This issue has been patched in version 0.3.0.",
"title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-30858.json?alt=media"
},
{
"category": "other",
"text": "0.00091",
"title": "EPSS"
},
{
"category": "other",
"text": "3.5",
"title": "NCSC Score"
},
{
"category": "other",
"text": "The value of the most recent EPSS score, The value of the most recent CVSS (V3) score, There is exploit data available from source Nvd",
"title": "NCSC Score top decreasing factors"
}
],
"product_status": {
"known_affected": [
"CSAFPID-5770072",
"CSAFPID-5771904",
"CSAFPID-5772001",
"CSAFPID-5364807",
"CSAFPID-5364808",
"CSAFPID-5364809",
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"CSAFPID-5909255",
"CSAFPID-5909256",
"CSAFPID-5909257",
"CSAFPID-5909258",
"CSAFPID-5909259",
"CSAFPID-5909260"
]
},
"references": [
{
"category": "external",
"summary": "Source - osv",
"url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGHSA-h6gw-8f77-mmmp.json?alt=media"
},
{
"category": "external",
"summary": "Source - github",
"url": "https://github.com/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"category": "external",
"summary": "Source raw - github",
"url": "https://api.github.com/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"category": "external",
"summary": "Source - nvd",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30858"
},
{
"category": "external",
"summary": "Source raw - nvd",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-30858"
},
{
"category": "external",
"summary": "Source - cveprojectv5",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-30858"
},
{
"category": "external",
"summary": "Source raw - cveprojectv5",
"url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/30xxx/CVE-2026-30858.json"
},
{
"category": "external",
"summary": "Source - first",
"url": "https://api.first.org/data/v1/epss?cve=CVE-2026-30858"
},
{
"category": "external",
"summary": "Source raw - first",
"url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
},
{
"category": "external",
"summary": "Source - github",
"url": "https://api.github.com/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"category": "external",
"summary": "Source - first",
"url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
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{
"category": "external",
"summary": "Source - osv",
"url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Go%2FGO-2026-4643.json?alt=media"
},
{
"category": "external",
"summary": "Source - osv",
"url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-30858.json?alt=media"
},
{
"category": "external",
"summary": "Reference - cveprojectv5; github; nvd; osv",
"url": "https://github.com/Tencent/WeKnora/security/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"category": "external",
"summary": "Reference - github",
"url": "https://github.com/advisories/GHSA-h6gw-8f77-mmmp"
},
{
"category": "external",
"summary": "Reference - github; osv",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30858"
},
{
"category": "external",
"summary": "Reference - osv",
"url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30858.json"
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"scores": [
{
"cvss_v3": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"baseScore": 7.5,
"baseSeverity": "HIGH"
},
"products": [
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"CSAFPID-5364808",
"CSAFPID-5364809",
"CSAFPID-5364810",
"CSAFPID-5364811",
"CSAFPID-5364812",
"CSAFPID-5364813",
"CSAFPID-5364814",
"CSAFPID-5364815",
"CSAFPID-5364816",
"CSAFPID-5364817",
"CSAFPID-5770072",
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"CSAFPID-5772001",
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"CSAFPID-5909257",
"CSAFPID-5909258",
"CSAFPID-5909259",
"CSAFPID-5909260"
]
}
],
"title": "CVE-2026-30858"
}
]
}