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CVE-2026-16634
TOML::XS versions before 0.06 for Perl bundle an unsupported and vulnerable version of tomlc99
Critical9.8EPSS 0.82%
- Published
- Updated
- Reserved
- Assigned by
- CPANSec
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 The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker.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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.82% · top 42% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
What to do
Solution: Upgrade to TOML::XS version 0.06 or later.
Workaround: Only parse trusted TOML files.
References (6)
- https://metacpan.org/release/FELIPE/TOML-XS-0.06/changes (opens in a new tab)release-notes
- https://raw.githubusercontent.com/cktan/tomlc99/29076dfd095bbbbd50a3c1b2760d29f4b83e74ac/README.md (opens in a new tab)
- https://github.com/cktan/tomlc99/issues/97 (opens in a new tab)issue-trackingexploit
- https://github.com/cktan/tomlc17 (opens in a new tab)
- https://toml.io/en/v1.0.0 (opens in a new tab)technical-description
- http://www.openwall.com/lists/oss-security/2026/07/24/4 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-16634)Record last updated .