CVE-2026-16634
Medium
Elevated severity or exploit probability.
CVSS base
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
0.8%
55.6th percentile
CISA KEV
Not listed
Weakness / dates
CWE-1104
Published 2026-07-24 · modified 2026-07-27
Description
TOML::XS versions before 0.06 for Perl bundle an unsupported and vulnerable version of tomlc99. The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker. Any caller that passes untrusted TOML to from_toml risks a stack overflow from a deeply-nested document. TOML::XS version 0.06 or later uses the successor tomlc17 library.
References
- https://github.com/cktan/tomlc17
- https://github.com/cktan/tomlc99/issues/97
- https://metacpan.org/release/FELIPE/TOML-XS-0.06/changes
- https://raw.githubusercontent.com/cktan/tomlc99/29076dfd095bbbbd50a3c1b2760d29f4b83e74ac/README.md
- https://toml.io/en/v1.0.0
- http://www.openwall.com/lists/oss-security/2026/07/24/4
- https://github.com/cktan/tomlc99/issues/97