{"id":"DEBIAN-CVE-2026-88359","details":"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.","modified":"2026-09-26T09:00:16.416676889Z","published":"2026-09-24T14:18:18.320Z","upstream":["CVE-2026-88359"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-88359"}],"affected":[{"package":{"name":"libfyaml","ecosystem":"Debian:12","purl":"pkg:deb/debian/libfyaml?arch=source&distro=bookworm"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88359.json"}},{"package":{"name":"libfyaml","ecosystem":"Debian:13","purl":"pkg:deb/debian/libfyaml?arch=source&distro=trixie"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88359.json"}},{"package":{"name":"libfyaml","ecosystem":"Debian:14","purl":"pkg:deb/debian/libfyaml?arch=source&distro=forky"},"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88359.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}