VULNERABILITY INTELLIGENCE

CVE-2026-88359

CVSS score6.5 MEDIUM
EPSS probability0.30%
CISA KEVNot currently listed
Published2026-09-24
Last modified2026-09-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-770

Primary references