CVE-2026-4177 - Vulnerability Analysis

Overview

YAML::Syck for Perl <= 1.36 contains multiple vulnerabilities including a heap buffer overflow in the YAML emitter caused by class names exceeding 512 bytes, letting attackers cause memory corruption, exploit requires crafted YAML input.

Severity & Score

Impact

Attackers can cause memory corruption leading to potential denial of service or code execution.

Mitigation

Update to the latest version beyond 1.36.

References

• https://github.com/cpan-authors/YAML-Syck/commit/e8844a31c8cf0052914b198fc784ed4e6b8ae69e.patch
• https://metacpan.org/release/TODDR/YAML-Syck-1.37_01/changes#L21
• http://www.openwall.com/lists/oss-security/2026/03/16/6

Social Media Activity(1 post)

TheHackerWire

@thehackerwire

Mar 18, 2026

🔴 CVE-2026-4177 - Critical (9.1) YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter. The heap overflow occurs when class names exceed the initial 512-byte allocation. The ba... 🔗 https://www.thehackerwire.com/vulnerability/CVE-2026-4177/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack

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