CVE-2026-16634

Critical

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 The tomlc99 library is no longer maintained, and has an uncontrolled recursion vulnerability publicly reported in the issue tracker.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

SeverityCritical

CVSS9.8

Exploit probability—

ProductTOML::XS

PublishedJul 24, 2026

First seenJul 24, 2026

Weakness typeCWE-1104CWE-1104 CWE-1395CWE-1395

How to fix

Update

FELIPE TOML::XS0.06 or later

Vendor advisories

metacpan.org/release/FELIPE/TOML-XS-0.06/changes

Affected products

Product	Affected versions	Fixed in
FELIPE TOML::XS	v < 0.06	0.06

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