High [CVE-2026-4177] YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter
This high-severity Red Hat Linux advisory covers CVE-2026-4177 affecting Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.
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Summary
YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter. Red Hat rates this important (CVSS 7.3).
Weakness: CWE-120. Affected package(s): perl-YAML-Syck.
Resolved in Red Hat advisory RHSA-2026:6470 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.
- perl-YAML-Syck-0:1.27-3.el7_9.1
- perl-YAML-Syck-0:1.30-6.el8_10
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:6470
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:6470 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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