Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/pantoniou/libfyaml/commit/20502068902d58c076da873117985798df2
- https://github.com/pantoniou/libfyaml/commit/93741a7c9331da9da65ef7a25f2d7d6a817
- https://github.com/pantoniou/libfyaml/issues/315
- https://github.com/pantoniou/libfyaml/issues/315
FAQ
What is CVE-2026-88359?
CVE-2026-88359 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 functio...
How severe is CVE-2026-88359?
CVE-2026-88359 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-88359?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.