{ "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-2026-33040", "tracking": { "current_release_date": "2026-03-24T02:12:40.845933Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33040", "initial_release_date": "2026-03-18T20:44:22.047078Z", "revision_history": [ { "date": "2026-03-18T20:44:22.047078Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-18T20:44:26.089681Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-19T11:40:00.458240Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-03-20T18:26:25.701131Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-20T18:26:36.864108Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:29:26.422213Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-20T18:29:30.283860Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:35:42.542866Z", "number": "8", "summary": "Unknown change." }, { "date": "2026-03-20T21:41:28.274310Z", "number": "9", "summary": "References created (1)." }, { "date": "2026-03-20T21:59:10.918315Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-21T13:47:13.351207Z", "number": "11", "summary": "References removed (1)." }, { "date": "2026-03-22T00:51:39.047013Z", "number": "12", "summary": "References created (1)." }, { "date": "2026-03-22T11:24:42.941271Z", "number": "13", "summary": "References removed (1)." }, { "date": "2026-03-23T00:53:49.223138Z", "number": "14", "summary": "References created (1)." }, { "date": "2026-03-24T02:12:35.653738Z", "number": "15", "summary": "CVSS created.| Products created (1).| Product Identifiers created (1)." }, { "date": "2026-03-24T02:12:39.763128Z", "number": "16", "summary": "NCSC Score updated." } ], "status": "interim", "version": "16" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.49.3", "product": { "name": "vers:unknown/<0.49.3", "product_id": "CSAFPID-5895592", "product_identification_helper": { "cpe": "cpe:2.3:a:protocol:libp2p:*:*:*:*:*:rust:*:*" } } } ], "category": "product_name", "name": "libp2p" } ], "category": "vendor", "name": "Protocol" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.49.3", "product": { "name": "vers:unknown/<0.49.3", "product_id": "CSAFPID-5874524" } } ], "category": "product_name", "name": "rust-libp2p" } ], "category": "vendor", "name": "libp2p" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33040", "cwe": { "id": "CWE-190", "name": "Integer Overflow or Wraparound" }, "notes": [ { "category": "description", "text": "### Summary\nThe Rust libp2p Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state.\nA specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication.\n\n### Attack Scenario\nAn attacker that can establish a libp2p Gossipsub session with a target node can crash the target by sending a single crafted PRUNE control message:\n1. Establish a standard libp2p transport session and negotiate a stream multiplexer.\n2. Open a Gossipsub stream and negotiate the meshsub protocol.\n3. Send one protobuf RPC containing ControlPrune with a very large backoff value (e.g. 18446744073709551615 / u64::MAX).\nWhen processed, the oversized backoff can reach time-update logic that adds Duration::from_secs(backoff) to Instant::now(), causing overflow and panic.\n\n### Impact\nRemote unauthenticated denial of service.\nAny application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message.\n### Patches\nUsers should upgrade to a release that hardens Gossipsub backoff handling.\n\nThis vulnerability was originally submitted by @revofusion to the Ethereum Foundation bug bounty program", "title": "github - https://github.com/advisories/GHSA-gc42-3jg7-rxr2" }, { "category": "description", "text": "### Summary\nThe Rust libp2p Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state.\nA specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication.\n\n### Attack Scenario\nAn attacker that can establish a libp2p Gossipsub session with a target node can crash the target by sending a single crafted PRUNE control message:\n1. Establish a standard libp2p transport session and negotiate a stream multiplexer.\n2. Open a Gossipsub stream and negotiate the meshsub protocol.\n3. Send one protobuf RPC containing ControlPrune with a very large backoff value (e.g. 18446744073709551615 / u64::MAX).\nWhen processed, the oversized backoff can reach time-update logic that adds Duration::from_secs(backoff) to Instant::now(), causing overflow and panic.\n\n### Impact\nRemote unauthenticated denial of service.\nAny application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message.\n### Patches\nUsers should upgrade to a release that hardens Gossipsub backoff handling.\n\nThis vulnerability was originally submitted by @revofusion to the Ethereum Foundation bug bounty program", "title": "github - https://api.github.com/advisories/GHSA-gc42-3jg7-rxr2" }, { "category": "description", "text": "libp2p-rust is the official rust language Implementation of the libp2p networking stack. In versions prior to 0.49.3, the Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state. A specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication. Any application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message. This issue has been fixed in version 0.49.3.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33040.json" }, { "category": "description", "text": "libp2p-rust is the official rust language Implementation of the libp2p networking stack. In versions prior to 0.49.3, the Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state. A specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication. Any application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message. This issue has been fixed in version 0.49.3.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33040" }, { "category": "other", "text": "0.0005", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "title": "CVSSV4" }, { "category": "other", "text": "8.7", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.4", "title": "NCSC Score" }, { "category": "other", "text": "Is related to an uncommon product vendor, Is related to (a version of) an uncommon product", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5874524", "CSAFPID-5895592" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-gc42-3jg7-rxr2" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-gc42-3jg7-rxr2" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-gc42-3jg7-rxr2" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33040.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33040" }, { "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/libp2p/rust-libp2p/security/advisories/GHSA-gc42-3jg7-rxr2" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-gc42-3jg7-rxr2" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33040" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "products": [ "CSAFPID-5874524", "CSAFPID-5895592" ] } ], "title": "CVE-2026-33040" } ] }