Vulnerability 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 The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker.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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
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/tomlc99/29076dfd095bbbbd50a3c1b2760d29f4
- 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
FAQ
What is CVE-2026-16634?
CVE-2026-16634 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly r...
How severe is CVE-2026-16634?
CVE-2026-16634 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-16634?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.