{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63495 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-63495 is a high-severity denial of service 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-2026-63495 and fix it if it is affected.\n\nWhat it is: CVE-2026-63495 is a high-severity denial of service 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-2026-63495 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-2026-63495/ (Markdown: https://insights.sbomify.com/CVE-2026-63495/index.md)","id":"CVE-2026-63495","markdown":"https://insights.sbomify.com/CVE-2026-63495/index.md","name":"CVE-2026-63495","record":{"aliases":["GHSA-qx89-wf2v-vgmx","RHSA-2026:41176"],"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 unauthenticated remote attacker can cause memory exhaustion and denial of service in Libevent WebSocket servers by sending fragmented frames.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Libevent is an event notification library. From 2.2.0-alpha-dev until 2.2.2-alpha, the libevent WebSocket server in ws.c accumulates fragmented frames in evws-\u003eincomplete_frames without enforcing a total message-size limit. An unauthenticated remote client can repeatedly send fragmented WebSocket frames below WS_MAX_RECV_FRAME_SZ with FIN=0, causing the evbuffer to grow without bound until the process or host exhausts memory. This issue is fixed in version 2.2.2-alpha.","ecosystems":["Red Hat:hummingbird:1"],"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: Unbounded memory accumulation in WebSocket server via fragmented frames","id":"CVE-2026-63495","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Snipe-IT: Stored XSS via Inline XML Rendering in the Uploaded Files API","id":"CVE-2026-63498"},"packages":[{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:2.1.12-19.hum1"],"introduced":["0"],"last_affected":[],"package":"libevent","purl":"pkg:rpm/redhat/libevent","source":"RHSA-2026:41176"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:2.1.12-19.hum1"],"introduced":["0"],"last_affected":[],"package":"libevent-devel","purl":"pkg:rpm/redhat/libevent-devel","source":"RHSA-2026:41176"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:2.1.12-19.hum1"],"introduced":["0"],"last_affected":[],"package":"libevent-doc","purl":"pkg:rpm/redhat/libevent-doc","source":"RHSA-2026:41176"}],"prev":{"headline":"Snipe-IT: 2FA bypass via the API token flow","id":"CVE-2026-63493"},"products":["libevent"],"published":"2026-08-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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 unauthenticated remote attacker can cause memory exhaustion and denial of service in Libevent WebSocket servers by sending fragmented frames.","url":"https://insights.sbomify.com/CVE-2026-63495/"}