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Fencer Intel
medium 5.0

CVE-2012-6139 json

libxslt before 1.1.28 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an (1) empty match attr…

published 2013-04-12 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-6000

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

libxslt before 1.1.28 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an (1) empty match attribute in a XSL key to the xsltAddKey function in keys.c or (2) uninitialized variable to the xsltDocumentFunction function in functions.c.

Patch / fix

  • libxslt Debian 14, Debian 13, Debian 12 1.1.26-14.1

debian advisories DEBIAN-CVE-2012-6139

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-6139 updated cvss 4.3

libxslt: two DoS issues fixed in 1.1.28

  • Red Hat Enterprise Linux 5 libxslt Red Hat Enterprise Linux 6 libxslt, libxslt-python, mingw32-libxslt
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.29% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • git.gnome.org https://git.gnome.org/browse/libxslt/commit/?id=dc11b6b379a882418093ecc8adf11f6166682e8d referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.gnome.org https://bugzilla.gnome.org/show_bug.cgi?id=685328 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.