{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63384 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-63384 is a high-severity vulnerability in libevent, published on 20 Aug 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-2026-63384 and fix it if it is affected.\n\nWhat it is: CVE-2026-63384 is a high-severity vulnerability in libevent, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63384 exists.\n\nAffected product: libevent. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-63384/ (Markdown: https://insights.sbomify.com/CVE-2026-63384/index.md)","id":"CVE-2026-63384","markdown":"https://insights.sbomify.com/CVE-2026-63384/index.md","name":"CVE-2026-63384","record":{"aliases":["AZL-96906","AZL-96935","AZL-97524","AZL-97554","BELL-CVE-2026-63384","DEBIAN-CVE-2026-63384","ECHO-79d4-b3d1-2520","GHSA-45c6-qx49-89m8","ROOT-OS-DEBIAN-11-CVE-2026-63384","UBUNTU-CVE-2026-63384"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Libevent library","requires_auth":"none","summary":"An attacker can cause a denial of service in applications using Libevent by triggering an integer overflow in header decoding that leads to invalid memory allocation.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"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":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has an incorrect integer conversion in event_tagging.c when evtag_unmarshal_header uses evtag_decode_int to decode an attacker-controlled uint32 payload length and returns it as a signed int. Values above INT_MAX become negative or truncated, and evtag_unmarshal_string can use the converted value in allocation sizing, producing a wrapped large allocation request and denial of service. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Libevent: `evtag_unmarshal_header()` decodes a wire `uint32` length into a signed `int` return value.","id":"CVE-2026-63384","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"Libevent: HTTP header handling bugs create risk of access control bypass.","id":"CVE-2026-63385"},"packages":[],"prev":{"headline":"Libevent: decode_tag_internal() can lead to out-of-bounds read","id":"CVE-2026-63383"},"products":["libevent"],"published":"2026-08-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-20","vendors":["libevent"]},"summary":"An attacker can cause a denial of service in applications using Libevent by triggering an integer overflow in header decoding that leads to invalid memory allocation.","url":"https://insights.sbomify.com/CVE-2026-63384/"}