CVE-2026-88359

Published: Sep 24, 2026Modified: Sep 25, 2026Deferred

6.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploitability: 2.8 / Impact: 3.6

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Related CWEs

CWE-770

Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.

References (4)

https://github.com/pantoniou/libfyaml/commit/20502068902d58c076da873117985798df2c7e74

Source: cve@mitre.org

https://github.com/pantoniou/libfyaml/commit/93741a7c9331da9da65ef7a25f2d7d6a817a1c29

Source: cve@mitre.org

https://github.com/pantoniou/libfyaml/issues/315

Source: cve@mitre.org

https://github.com/pantoniou/libfyaml/issues/315

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.