CVE-2013-6393

The yaml_parser_scan_tag_uri function in scanner.c in LibYAML before 0.1.5 performs an incorrect cast, which allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted tags in a YAML document, which triggers a heap-based buffer overflow.

Published: 2014-02-06 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-6393 is rated Moderate Risk (61.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 9.23%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.56% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2013-6393

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 7.68% 9.23% +1.56%
2 2026-06-11 8.06% 7.68% -0.38%
3 2025-09-29 — 8.06% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-6393

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2013-6393

GitHub Security Advisory for CVE-2013-6393

GHSA-m75h-cghq-c8h5 · Severity: critical · Ecosystem: npm — Heap Based Buffer Overflow in libyaml

OS Trackers for CVE-2013-6393

vendor priority summary link
debian not yet assigned CVE-2013-6393 not yet assigned priority: Debian including 2 source packages (libyaml, libyaml-libyaml-perl), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2013-6393
gentoo normal CVE-2013-6393: 1 GLSA(s) (201403-02), 1 atom(s) (dev-libs/libyaml); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-6393
redhat medium — https://access.redhat.com/security/cve/CVE-2013-6393
suse medium CVE-2013-6393 severity moderate: SUSE including 258 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 351 product×package rows across 77 product lines (HPE Helion OpenStack 8, SUSE CaaS Platform 4.0, … (77 product lines)): Known Affected 157, Fixed 149, Known Not Affected 45. https://www.suse.com/security/cve/CVE-2013-6393/
ubuntu medium CVE-2013-6393 medium priority: Ubuntu including 2 source packages (libyaml, libyaml-libyaml-perl), 11 status rows across 6 suites (lucid, precise, quantal, raring, saucy, upstream): released 7, ignored 3, needed 1. https://ubuntu.com/security/CVE-2013-6393

Affected software / configurations for CVE-2013-6393

Vendor Product Version Raw CPE
pyyaml libyaml <= 0.1.4 cpe:2.3:a:pyyaml:libyaml:*:*:*:*:*:*:*:*
pyyaml libyaml 0.0.1 cpe:2.3:a:pyyaml:libyaml:0.0.1:*:*:*:*:*:*:*
pyyaml libyaml 0.1.1 cpe:2.3:a:pyyaml:libyaml:0.1.1:*:*:*:*:*:*:*
pyyaml libyaml 0.1.2 cpe:2.3:a:pyyaml:libyaml:0.1.2:*:*:*:*:*:*:*
pyyaml libyaml 0.1.3 cpe:2.3:a:pyyaml:libyaml:0.1.3:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 12.10 cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
canonical ubuntu_linux 13.10 cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:*
redhat openstack 3.0 cpe:2.3:a:redhat:openstack:3.0:*:*:*:*:*:*:*
redhat openstack 4.0 cpe:2.3:a:redhat:openstack:4.0:*:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
opensuse opensuse 11.4 cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
opensuse opensuse 13.1 cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
opensuse opensuse 13.2 cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

References for CVE-2013-6393

URL Tags
http://advisories.mageia.org/MGASA-2014-0040.html Third Party Advisory
http://archives.neohapsis.com/archives/bugtraq/2014-04/0134.html Broken Link
http://archives.neohapsis.com/archives/bugtraq/2014-10/0103.html Broken Link
http://lists.opensuse.org/opensuse-updates/2014-02/msg00064.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2014-02/msg00065.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2015-02/msg00078.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-04/msg00050.html Third Party Advisory
http://osvdb.org/102716
http://rhn.redhat.com/errata/RHSA-2014-0353.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2014-0354.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2014-0355.html Third Party Advisory
http://www.debian.org/security/2014/dsa-2850 Third Party Advisory
http://www.debian.org/security/2014/dsa-2870 Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2015:060 Third Party Advisory
http://www.securityfocus.com/bid/65258 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-2098-1 Third Party Advisory
https://bitbucket.org/xi/libyaml/commits/tag/0.1.5 Issue Tracking
https://bugzilla.redhat.com/attachment.cgi?id=847926&action=diff Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1033990 Issue Tracking Patch
https://puppet.com/security/cve/cve-2013-6393
https://support.apple.com/kb/HT6536 Third Party Advisory
cvelogic Threat Intelligence