Upstream information

CVE-2026-4177 at MITRE

Description

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 base64 decoder could read past the buffer end on trailing newlines.

strtok mutated n->type_id in place, corrupting shared node data.

A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having critical severity.

CVSS v3 Scores
CVSS detail CNA (CISA-ADP)
Base Score 9.1
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact None
Availability Impact High
CVSSv3 Version 3.1
SUSE Bugzilla entry: 1259757 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Liberty Linux 8
  • perl-YAML-Syck >= 1.30-6.el8_10
 Patchnames:
RHSA-2026:6470
SUSE Package Hub 15 SP7
  • perl-YAML-Syck >= 1.450.0-bp157.2.3.1
 Patchnames:
openSUSE-2026-180
openSUSE Leap 16.0
  • perl-YAML-Syck >= 1.450.0-bp160.1.1
 Patchnames:
openSUSE-Leap-16.0-packagehub-263
openSUSE Tumbleweed
  • perl-YAML-Syck >= 1.440.0-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10551

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Package Hub 15 SP7 perl-YAML-Syck Released

SUSE Timeline for this CVE

CVE page created: Tue Mar 17 01:00:02 2026
CVE page last modified: Sat May 30 17:20:53 2026