CVE-2025-11683: YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and pote

Q: How do I fix CVE-2025-11683?

yaml\: upgrade to 1.36. Exact commands for each OS are on this page.

Q: Is CVE-2025-11683 being exploited?

CVE-2025-11683 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-11683 affect?

CVE-2025-11683 affects yaml\. Severity is medium (CVSS 6.5). 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

Q: How urgent is CVE-2025-11683?

Priority 29/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2025-11683 is a medium-severity flaw (CVSS 6.5) affecting yaml\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-119
Published	2025-10-16
Last modified	2026-10-08

Publisher (CNA): CPANSec · Vendor: toddr

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-16 01:15 UTCPublished CVE record published
2026-10-08 11:10 UTCUpdated Record last modified

toddr yaml\ UPGRADE

Affected: < 1.36

Fixed in: 1.36

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy yaml || rpm -q yaml || yaml --version

2. UPGRADE to 1.36 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade yaml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yaml

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-11683?

yaml\: upgrade to 1.36. Exact commands for each OS are on this page.

Is CVE-2025-11683 being exploited?

CVE-2025-11683 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-11683 affect?

CVE-2025-11683 affects yaml\. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2025-11683?

Priority 29/100. No elevated risk signals yet.

Software pages

Perl vulnerabilities

Related CVEs

CVE-2026-4177 CRITICAL 9.1 UPGRADE YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-seve

References

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