9.1

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.43% 0.343
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.3 3.9 3.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

CWE-122 Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

http://www.openwall.com/lists/oss-security/2026/03/16/6
Third Party Advisory
Mailing List
https://bugzilla.redhat.com/show_bug.cgi?id=2448277
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4177.json
https://github.com/cpan-authors/YAML-Syck/commit/e8844a31c8cf0052914b198fc784ed4e6b8ae69e.patch
Patch
https://metacpan.org/release/TODDR/YAML-Syck-1.37_01/changes#L21
Release Notes
https://access.redhat.com/errata/RHSA-2026:6470
https://access.redhat.com/errata/RHSA-2026:8311
https://access.redhat.com/security/cve/CVE-2026-4177