{"id":"CVE-2026-88359","title":"libfyaml 0.9.6 contains a stack exhaustion vulnerability in fy_atom_iter_format()","summary":"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…","severity":"none","published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T21:08:55.030","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88359","references":[{"url":"https://github.com/pantoniou/libfyaml/commit/20502068902d58c076da873117985798df2c7e74","label":"cve@mitre.org"},{"url":"https://github.com/pantoniou/libfyaml/commit/93741a7c9331da9da65ef7a25f2d7d6a817a1c29","label":"cve@mitre.org"},{"url":"https://github.com/pantoniou/libfyaml/issues/315","label":"cve@mitre.org"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-24T14:44:21.326Z","slug":"CVE-2026-88359","body":"## Overview\n\nlibfyaml 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}