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CVE-2026-63676 is an algorithmic-complexity vulnerability in the libyaml parsing library as used by Perl YAML packages. Crafted YAML input can trigger excessive backtracking and exponential parsing time, causing the affected process to consume resources for an extended period. Amazon Linux 2 and Amazon Linux 2023 identify their perl-yaml packages as affected; Amazon Linux 2023 also lists perl-yaml-tests. Debian libyaml-perl is also identified as affected by an unpatched-vulnerability check.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible, low-complexity vulnerability affecting Amazon Linux 2023 perl-yaml/perl-yaml-tests packages, with no privileges or user interaction required and an availability-only impact according to the provided CVSS v3 vector.
A vulnerability affecting the perl-yaml package on Amazon Linux 2, with network-reachable, low-complexity, unauthenticated attack conditions and an availability-only impact according to the listed CVSS v3 vector.
A high-severity, network-reachable vulnerability tracked as CVE-2026-63676, detected on Debian Linux systems and associated with the libyaml-perl package. The provided CVSS v3 vector indicates no privileges or user interaction are required and potential high confidentiality, integrity, and availability impact.
An important-severity denial-of-service vulnerability in the libyaml library where backtracking can cause exponential load time. The notice assigns CVSS v3.1 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.