What’s Vulnerable › Vulnerabilities

CVE-2026-88359

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-25
• Weakness: CWE-770

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.

References

• https://github.com/pantoniou/libfyaml/commit/20502068902d58c076da873117985798df2c7e74
• https://github.com/pantoniou/libfyaml/commit/93741a7c9331da9da65ef7a25f2d7d6a817a1c29
• https://github.com/pantoniou/libfyaml/issues/315
• https://github.com/pantoniou/libfyaml/issues/315

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