{ "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-2026-33129", "tracking": { "current_release_date": "2026-03-25T10:02:06.685256Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33129", "initial_release_date": "2026-03-18T17:08:16.591509Z", "revision_history": [ { "date": "2026-03-18T17:08:16.591509Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T17:08:27.995760Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-19T11:40:07.831136Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T18:28:51.026672Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:28:54.364111Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:29:15.116208Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T18:29:18.812048Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-20T20:25:25.552151Z", "number": "8", "summary": "Products created (9).| Product Identifiers created (9).| Exploits created (1)." }, { "date": "2026-03-20T20:25:29.143026Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-20T20:39:00.102487Z", "number": "10", "summary": "Unknown change." }, { "date": "2026-03-20T21:41:34.644594Z", "number": "11", "summary": "References created (3)." }, { "date": "2026-03-20T21:58:59.419998Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-21T13:47:19.442025Z", "number": "13", "summary": "References removed (3)." }, { "date": "2026-03-22T00:51:45.224008Z", "number": "14", "summary": "References created (3)." }, { "date": "2026-03-22T11:24:48.610667Z", "number": "15", "summary": "References removed (3)." }, { "date": "2026-03-23T00:53:55.301175Z", "number": "16", "summary": "References created (3)." }, { "date": "2026-03-23T05:15:51.677481Z", "number": "17", "summary": "References removed (3)." }, { "date": "2026-03-24T20:56:13.586304Z", "number": "18", "summary": "References created (3)." }, { "date": "2026-03-24T20:57:33.093832Z", "number": "19", "summary": "NCSC Score updated." } ], "status": "interim", "version": "19" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/2.0.0", "product": { "name": "vers:unknown/2.0.0", "product_id": "CSAFPID-5875818", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.0:*:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc1", "product": { "name": "vers:unknown/2.0.1-rc1", "product_id": "CSAFPID-5875819", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc1:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc2", "product": { "name": "vers:unknown/2.0.1-rc2", "product_id": "CSAFPID-5875820", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc2:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc3", "product": { "name": "vers:unknown/2.0.1-rc3", "product_id": "CSAFPID-5875821", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc3:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc4", "product": { "name": "vers:unknown/2.0.1-rc4", "product_id": "CSAFPID-5875822", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc4:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc5", "product": { "name": "vers:unknown/2.0.1-rc5", "product_id": "CSAFPID-5875823", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc5:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc6", "product": { "name": "vers:unknown/2.0.1-rc6", "product_id": "CSAFPID-5875824", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc6:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc7", "product": { "name": "vers:unknown/2.0.1-rc7", "product_id": "CSAFPID-5875825", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc7:*:*:*:node.js:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1-rc8", "product": { "name": "vers:unknown/2.0.1-rc8", "product_id": "CSAFPID-5875826", "product_identification_helper": { "cpe": "cpe:2.3:a:h3:h3:2.0.1:rc8:*:*:*:node.js:*:*" } } } ], "category": "product_name", "name": "h3" } ], "category": "vendor", "name": "h3" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=2.0.1-beta.0|<2.0.1-rc.9", "product": { "name": "vers:unknown/>=2.0.1-beta.0|<2.0.1-rc.9", "product_id": "CSAFPID-5874587" } } ], "category": "product_name", "name": "h3" } ], "category": "vendor", "name": "h3js" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33129", "cwe": { "id": "CWE-208", "name": "Observable Timing Discrepancy" }, "notes": [ { "category": "description", "text": "### Summary\nA Timing Side-Channel vulnerability exists in the `requireBasicAuth` function due to the use of unsafe string comparison (`!==`). This allows an attacker to deduce the valid password character-by-character by measuring the server's response time, effectively bypassing password complexity protections.\n\n### Details\nThe vulnerability is located in the `requireBasicAuth` function. The code performs a standard string comparison between the user-provided password and the expected password:\n\n~~~typescript\nif (opts.password && password !== opts.password) {\n throw autheFailed(event, opts?.realm);\n}\n~~~\n\nIn V8 (and most runtime environments), the `!==` operator is optimized to \"fail fast.\" It stops execution and returns `false` as soon as it encounters the first mismatched byte.\n* If the first character is wrong, it returns immediately.\n* If the first character is correct but the second is wrong, it takes slightly longer.\n\nBy statistically analyzing these minute timing differences over many requests, an attacker can determine the correct password one character at a time.\n\n### PoC\nThis vulnerability is exploitable in real-world scenarios without direct access to the server machine.\n\nTo reproduce this, an attacker can send two packets (or bursts of packets) at the exact same time:\n1. **Packet A:** Contains a password that is known to be incorrect starting at the first character (e.g., `AAAA...`).\n2. **Packet B:** Contains a password where the first character is a guess (e.g., `B...`).\n\nBy measuring the time-to-first-byte (TTFB) or total response time of these concurrent requests, the attacker can filter out network jitter. If Packet B takes consistently longer to return than Packet A, the first character is confirmed as correct. This process is repeated for the second character, and so on. Tests confirm this timing difference is statistically consistent enough to recover credentials remotely.\n\n### Impact\n\nThis vulnerability allows remote attackers to recover passwords. While network jitter makes this difficult over the internet, it is highly effective in local networks or cloud environments where the attacker is co-located. It reduces the complexity of cracking a password from exponential (guessing the whole string) to linear (guessing one char at a time).", "title": "github - https://github.com/advisories/GHSA-26f5-8h2x-34xh" }, { "category": "description", "text": "### Summary\nA Timing Side-Channel vulnerability exists in the `requireBasicAuth` function due to the use of unsafe string comparison (`!==`). This allows an attacker to deduce the valid password character-by-character by measuring the server's response time, effectively bypassing password complexity protections.\n\n### Details\nThe vulnerability is located in the `requireBasicAuth` function. The code performs a standard string comparison between the user-provided password and the expected password:\n\n~~~typescript\nif (opts.password && password !== opts.password) {\n throw autheFailed(event, opts?.realm);\n}\n~~~\n\nIn V8 (and most runtime environments), the `!==` operator is optimized to \"fail fast.\" It stops execution and returns `false` as soon as it encounters the first mismatched byte.\n* If the first character is wrong, it returns immediately.\n* If the first character is correct but the second is wrong, it takes slightly longer.\n\nBy statistically analyzing these minute timing differences over many requests, an attacker can determine the correct password one character at a time.\n\n### PoC\nThis vulnerability is exploitable in real-world scenarios without direct access to the server machine.\n\nTo reproduce this, an attacker can send two packets (or bursts of packets) at the exact same time:\n1. **Packet A:** Contains a password that is known to be incorrect starting at the first character (e.g., `AAAA...`).\n2. **Packet B:** Contains a password where the first character is a guess (e.g., `B...`).\n\nBy measuring the time-to-first-byte (TTFB) or total response time of these concurrent requests, the attacker can filter out network jitter. If Packet B takes consistently longer to return than Packet A, the first character is confirmed as correct. This process is repeated for the second character, and so on. Tests confirm this timing difference is statistically consistent enough to recover credentials remotely.\n\n### Impact\n\nThis vulnerability allows remote attackers to recover passwords. While network jitter makes this difficult over the internet, it is highly effective in local networks or cloud environments where the attacker is co-located. It reduces the complexity of cracking a password from exponential (guessing the whole string) to linear (guessing one char at a time).", "title": "github - https://api.github.com/advisories/GHSA-26f5-8h2x-34xh" }, { "category": "description", "text": "H3 is a minimal H(TTP) framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison (!==). This allows an attacker to deduce the valid password character-by-character by measuring the server's response time, effectively bypassing password complexity protections. This issue is fixed in version 2.0.1-rc.9.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33129" }, { "category": "description", "text": "H3 is a minimal H(TTP) framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison (!==). This allows an attacker to deduce the valid password character-by-character by measuring the server's response time, effectively bypassing password complexity protections. This issue is fixed in version 2.0.1-rc.9.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33129.json" }, { "category": "other", "text": "0.00029", "title": "EPSS" }, { "category": "other", "text": "3.4", "title": "NCSC Score" }, { "category": "other", "text": "Exploit code publicly available, Is related to (a version of) an uncommon product, There is exploit data available from source Nvd, Is related to CWE-208 (Observable Timing Discrepancy)", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5874587", "CSAFPID-5875818", "CSAFPID-5875819", "CSAFPID-5875820", "CSAFPID-5875821", "CSAFPID-5875822", "CSAFPID-5875823", "CSAFPID-5875824", "CSAFPID-5875825", "CSAFPID-5875826" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-26f5-8h2x-34xh" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-26f5-8h2x-34xh" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-26f5-8h2x-34xh" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33129" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33129.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-26f5-8h2x-34xh" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/h3js/h3/pull/1283" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd", "url": "https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33129" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.9, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5874587", "CSAFPID-5875818", "CSAFPID-5875819", "CSAFPID-5875820", "CSAFPID-5875821", "CSAFPID-5875822", "CSAFPID-5875823", "CSAFPID-5875824", "CSAFPID-5875825", "CSAFPID-5875826" ] } ], "title": "CVE-2026-33129" } ] }