CVE-2025-11683

YAML::Syck versions before 1.36 for Perl has missing Null-Terminators which causes Out-of-Bounds Read and potential Information Disclosure

MEDIUM
6.5
CVSS Score
Published: October 16, 2025 at 12:14 AM UTC
Updated: October 8, 2026 at 11:10 AM UTC
2 products affected across 1 vendorYamlYaml::syck

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values.  There is no indication that the issue leads to accessing memory outside that allocated to the module.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.360 ≤ v < 1.360\
Affected range stops below 1.36, so it looks safe — our inference, not a vendor statement
v < 1.36

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

PatchIssue Tracking
Source: cverecord
https://github.com/cpan-authors/YAML-Syck/pull/65
Release NotesProduct
Source: cverecord
https://metacpan.org/dist/YAML-Syck/changes

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMCISA-ADP
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-119

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