Detections
Analytics
CVE-2026-88359
medium
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/issues/315
https://github.com/pantoniou/libfyaml/commit/93741a7c9331da9da65ef7a25f2d7d6a817a1c29
https://github.com/pantoniou/libfyaml/commit/20502068902d58c076da873117985798df2c7e74