{"answers":{"affected":"2 open source packages ship an affected version, including libp2p-gossipsub. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-33040 in the wild and no public exploit code.","fix":"Upgrade libp2p-gossipsub to 0.49.3 or later.","what":"CVE-2026-33040 is a high-severity vulnerability in rust-libp2p, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-33040 and fix it if it is affected.\n\nWhat it is: CVE-2026-33040 is a high-severity vulnerability in rust-libp2p, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-33040 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- libp2p-gossipsub (crates.io): affected all versions; fixed in 0.49.3\n- libp2p-gossipsub (crates.io): affected all versions; fixed in 0.49.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-33040/ (Markdown: https://insights.sbomify.com/CVE-2026-33040/index.md)","id":"CVE-2026-33040","markdown":"https://insights.sbomify.com/CVE-2026-33040/index.md","name":"CVE-2026-33040","record":{"aliases":["GHSA-gc42-3jg7-rxr2","UBUNTU-CVE-2026-33040"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Rust libp2p library","requires_auth":"none","summary":"A remote attacker can crash a libp2p Gossipsub listener by sending a crafted PRUNE message with an excessive backoff value, causing an integer overflow panic.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"libp2p-gossipsub","vendor":"protocol"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"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","version":"4.0"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"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.","ecosystems":["crates.io"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"libp2p-rust: Gossipsub PRUNE.backoff Duration Overflow","id":"CVE-2026-33040","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"AVideo has an Unauthenticated Password Hash Oracle via encryptPass.json.php","id":"CVE-2026-33041"},"packages":[{"ecosystem":"crates.io","fixed":["0.49.3"],"introduced":["0"],"last_affected":[],"package":"libp2p-gossipsub","purl":null,"source":"GHSA-gc42-3jg7-rxr2"},{"ecosystem":"crates.io","fixed":["0.49.3"],"introduced":["0"],"last_affected":[],"package":"libp2p-gossipsub","purl":"pkg:cargo/libp2p-gossipsub","source":"GHSA-gc42-3jg7-rxr2"}],"prev":{"headline":"AVideo vulnerable to unauthenticated SSRF via HTTP redirect bypass in LiveLinks proxy","id":"CVE-2026-33039"},"products":["rust-libp2p"],"published":"2026-03-20","related":[{"cvss_score":8.2,"headline":"libp2p-gossipsub: Gossipsub PRUNE Backoff Heartbeat Instant Overflow","id":"CVE-2026-34219","kev_date_added":null,"published":"2026-03-31"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-20","vendors":["libp2p"]},"summary":"A remote attacker can crash a libp2p Gossipsub listener by sending a crafted PRUNE message with an excessive backoff value, causing an integer overflow panic.","url":"https://insights.sbomify.com/CVE-2026-33040/"}