CVE-2012-1152: Multiple format string vulnerabilities in the error reporting functionality in the YAML::LibYAML (aka YAML-Lib

Routine

MEDIUM 5.0MITIGATE

CVE-2012-1152 is a medium-severity flaw (CVSS 5.0) affecting yaml\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple format string vulnerabilities in the error reporting functionality in the YAML::LibYAML (aka YAML-LibYAML and perl-YAML-LibYAML) module 0.38 for Perl allow remote attackers to cause a denial of service (process crash) via format string specifiers in a (1) YAML stream to the Load function, (2) YAML node to the load_node function, (3) YAML mapping to the load_mapping function, or (4) YAML sequence to the load_sequence function.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-134
Published	2012-09-09
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: ingy

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-09-09 21:55 UTCPublished CVE record published
2026-06-16 23:39 UTCUpdated Record last modified

ingy yaml\ MITIGATE

Affected: \ libyaml

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2012-1152?

yaml\: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2012-1152 being exploited?

CVE-2012-1152 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-2012-1152 affect?

CVE-2012-1152 affects yaml\. Severity is medium (CVSS 5.0). Multiple format string vulnerabilities in the error reporting functionality in the YAML::LibYAML (aka YAML-LibYAML and perl-YAML-LibYAML) module 0.38 for Perl allow remote attackers to cause a denial of service (process crash) via format st

How urgent is CVE-2012-1152?

Priority 39/100. No elevated risk signals yet.

Software pages

Perl vulnerabilities

Related CVEs

CVE-2025-11683 MEDIUM 6.5 UPGRADE YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and pote
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

← Back to latest CVEs