Loading vulnerability…
CVE-2026-13713 is a use-after-free and double-free vulnerability in the bundled libsyck parser used by YAML::Syck for Perl before version 1.47. When an anchor is redefined or removed, the anchor handlers can free its SyckNode while that node remains referenced by the parser value stack. Subsequent processing in syck_hdlr_add_node can reach and free the same node again. The flaw is reachable through the default YAML::Syck Load parsing path without special feature flags.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting the FreeBSD p5-yaml-syck (YAML-Syck) package. The supplied content does not describe the specific flaw.
A locally exploitable denial-of-service vulnerability affecting the perl-yaml-syck package on Miracle Linux 8, with no impact to confidentiality or integrity and high availability impact according to the supplied CVSS v3 vector.
A vulnerability tracked as CVE-2026-13713 affecting Rocky Linux 8 perl-yaml-syck package variants. The supplied content does not describe the underlying flaw beyond CVSS metadata.
A denial-of-service vulnerability in YAML::Syck, the Perl interface to the libsyck YAML data-serialization library. A crafted YAML document can cause an availability impact in affected perl-YAML-Syck installations on Red Hat Enterprise Linux 8.
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.