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CVE-2013-6393

27
FAUCET Score

CVE-2013-6393 describes a heap-based buffer overflow vulnerability in LibYAML versions prior to 0.1.5, specifically within the yaml_parser_scan_tag_uri function, affecting products like Canonical, Debian, OpenSUSE, PyYAML, and Red Hat. This flaw allows remote attackers to trigger a denial of service or potentially execute arbitrary code through crafted YAML tags. With a CVSS score of 6.8 (medium severity), it requires medium attack complexity but can lead to partial confidentiality, integrity, and availability impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.1.4CPE matchmatch criteria
cpe:2.3:a:pyyaml:libyaml:*:*:*:*:*:*:*:*
0.0.1CPE matchmatch criteria
cpe:2.3:a:pyyaml:libyaml:0.0.1:*:*:*:*:*:*:*
0.1.1CPE matchmatch criteria
cpe:2.3:a:pyyaml:libyaml:0.1.1:*:*:*:*:*:*:*
0.1.2CPE matchmatch criteria
cpe:2.3:a:pyyaml:libyaml:0.1.2:*:*:*:*:*:*:*
0.1.3CPE matchmatch criteria
cpe:2.3:a:pyyaml:libyaml:0.1.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
8.05%
Probability of exploitation in next 30 days
EPSS Percentile
94.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0805 is in the 93rd percentile among its peer group of 19,954 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (14)

npmpatch availablevia ghsa
Product: libyamlFixed in: 0.2.3
redhatpatch availablevia redhat_api
Product: OpenStack 3 for RHEL 6Fixed in: ruby193-libyaml-0:0.1.4-5.1.el6
View patch
redhatpatch availablevia redhat_api
Product: OpenStack 4 for RHEL 6Fixed in: libyaml-0:0.1.3-1.4.el6
View patch
redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Common for RHEL 6Fixed in: libyaml-0:0.1.3-1.4.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for RHEL-6Fixed in: ruby193-libyaml-0:0.1.4-5.1.el6
View patch
redhatpatch availablevia redhat_api
Product: OpenStack 3 for RHEL 6Fixed in: libyaml-0:0.1.3-1.4.el6
View patch
redhatno patchvia redhat_api
Product: Red Hat Software CollectionsFixed in: libyaml
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libyaml
redhatend of lifevia redhat_api
Product: Red Hat Subscription Asset ManagerFixed in: libyaml
redhatend of lifevia redhat_api
Product: OpenShift Enterprise 1Fixed in: ruby193-libyaml
redhatend of lifevia redhat_api
Product: Red Hat Enterprise MRG 1Fixed in: libyaml
redhatend of lifevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: libyaml
redhatend of lifevia redhat_api
Product: Red Hat Satellite 5Fixed in: libyaml

Vendor Advisories (2)

npmGHSA-m75h-cghq-c8h5critical

Heap Based Buffer Overflow in libyaml

Aug 31, 2020
redhatCVE-2013-6393Moderate

libyaml: heap-based buffer overflow when parsing YAML tags

Jan 27, 2014

References

advisories.mageia.org / MGASA-2014-0040.html
Third Party Advisory
archives.neohapsis.com / archives/bugtraq/2014-04/0134.html
Broken Link
archives.neohapsis.com / archives/bugtraq/2014-10/0103.html
Broken Link
lists.opensuse.org / opensuse-updates/2014-02/msg00064.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2014-02/msg00065.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2015-02/msg00078.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2016-04/msg00050.html
Third Party Advisory
osvdb.org / 102716
rhn.redhat.com / errata/RHSA-2014-0353.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2014-0354.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2014-0355.html
Third Party Advisory
bitbucket.org / xi/libyaml/commits/tag/0.1.5
Issue Tracking
bugzilla.redhat.com / attachment.cgi
Issue Tracking
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatch
puppet.com / security/cve/cve-2013-6393
support.apple.com / kb/HT6536
Third Party Advisory
debian.org / security/2014/dsa-2850
Third Party Advisory
debian.org / security/2014/dsa-2870
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
securityfocus.com / bid/65258
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-2098-1
Third Party Advisory