# CVE-2026-16634

## Summary

- **CVE ID:** CVE-2026-16634
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-1104, CWE-1395
- **Published:** Jul 24, 2026
- **Last Modified:** Jul 27, 2026

## 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The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker.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.

## Affected Products

- FELIPE — TOML::XS (0)

## References

- [CNA](https://metacpan.org/release/FELIPE/TOML-XS-0.06/changes)
- [CNA](https://raw.githubusercontent.com/cktan/tomlc99/29076dfd095bbbbd50a3c1b2760d29f4b83e74ac/README.md)
- [CNA](https://github.com/cktan/tomlc99/issues/97)
- [CNA](https://github.com/cktan/tomlc17)
- [CNA](https://toml.io/en/v1.0.0)
- [CVE](http://www.openwall.com/lists/oss-security/2026/07/24/4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.51%
- **EPSS Percentile:** 42.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._