{"id":"CVE-2026-88359","aliases":["DEBIAN-CVE-2026-88359","EUVD-2026-85909","GHSA-3qj9-89fg-m5cw","UBUNTU-CVE-2026-88359"],"status":"published","title":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When...","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00296,"percentile":0.22512,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-770"],"published":"2026-09-24T00:00:00Z","modified":"2026-10-28T11:00:48Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"libfyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.12-2","0.8-1","0.9-1","0.9-2","0.9.2-1","0.9.3-1","0.9.4-1"]},{"source":"osv","ecosystem":"Debian:13","package":"libfyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8-1","0.9-1","0.9-2","0.9.2-1","0.9.3-1","0.9.4-1"]},{"source":"osv","ecosystem":"Debian:14","package":"libfyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8-1","0.9-1","0.9-2","0.9.2-1","0.9.3-1","0.9.4-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libfyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.11-2","0.7.12-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libfyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8-1","0.8-1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libfyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.4-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libfyaml","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8-1build1","0.9-2","0.9.2-1","0.9.3-1","0.9.4-1"]}],"references":[{"url":"https://github.com/pantoniou/libfyaml/issues/315","tags":["exploit","report"]},{"url":"https://github.com/pantoniou/libfyaml/commit/93741a7c9331da9da65ef7a25f2d7d6a817a1c29","tags":["fix"]},{"url":"https://github.com/pantoniou/libfyaml/commit/20502068902d58c076da873117985798df2c7e74","tags":["fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88359","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-3qj9-89fg-m5cw"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88359.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-88359","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-88359","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88359","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-88359","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","status":"published","published":"2026-09-24T00:00:00Z","modified":"2026-09-25T16:18:55.317Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T13:41:53.237769Z"}],"euvd":[{"id":"EUVD-2026-85909","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","status":"published","published":"2026-09-24T00:00:00Z","modified":"2026-09-25T16:18:55Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T17:27:55.413842Z"}],"ghsa":[{"id":"GHSA-3qj9-89fg-m5cw","title":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When...","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","status":"published","published":"2026-09-24T15:31:31Z","modified":"2026-09-25T18:31:20Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:12:27.190195Z"}],"nvd":[{"id":"CVE-2026-88359","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","status":"published","published":"2026-09-24T14:18:18.32Z","modified":"2026-09-25T17:17:17.49Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:12:51.036099Z"}],"osv":[{"id":"CVE-2026-88359","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","status":"published","published":"2026-09-24T00:00:00Z","modified":"2026-10-28T11:00:48.668580552Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:19.210277Z"},{"id":"DEBIAN-CVE-2026-88359","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","status":"published","published":"2026-09-24T14:18:18.32Z","modified":"2026-09-26T09:00:16.416676889Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:46:05.506112Z"},{"id":"UBUNTU-CVE-2026-88359","description":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format(). When processing a specially crafted YAML document containing a very large literal or folded block scalar, the function repeatedly grows an internal buffer using alloca() inside a loop. The allocated stack memory is not released until the function returns, causing cumulative stack growth that can exceed the process stack limit and result in SIGSEGV and denial of service.","status":"published","published":"2026-09-24T14:18:00Z","modified":"2026-10-17T13:01:15.451138998Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:57:24.828975Z"}]}}