CVE-2026-16634
TOML::XS versions before 0.06 for Perl bundle an unsupported and vulnerable version of tomlc99.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.51%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker.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 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.51% probability · 42th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1104
- Source
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.