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Fencer Vulns
high 7.5

CVE-2026-8177 json

XML::LibXML versions through 2.0210 for Perl read out-of-bounds heap memory when parsing XML node names containing truncated UTF-8 byte sequences

published 2026-05-10 6 mo ago modified 2026-09-18 52 d ago also EUVD-2026-29000

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

XML::LibXML versions through 2.0210 for Perl read out-of-bounds heap memory when parsing XML node names containing truncated UTF-8 byte sequences.

A node name ending in the middle of a multi byte UTF-8 sequence causes the parser to read past the end of the input string into adjacent heap memory.

Any Perl process that passes attacker controlled strings to XML::LibXML's DOM node-name methods can reach this path on the default API. The likely consequence is a crash, causing denial of service.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 1:2.0210-4.el10_2.1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 1:2.0210-4.el10_0.1
  • Red Hat Red Hat Enterprise Linux 8 1:2.0132-3.el8_10
  • Red Hat Red Hat Enterprise Linux 9 1:2.0206-5.el9_8.1
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 1:2.0206-5.el9_2.1
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 1:2.0206-5.el9_4.1
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 1:2.0206-5.el9_6.1
  • libxml-libxml-perl Debian 12 2.0207+dfsg+really+2.0134-1+deb12u1
  • libxml-libxml-perl Debian 13 2.0207+dfsg+really+2.0134-5+deb13u1
  • libxml-libxml-perl Debian 14 2.0207+dfsg+really+2.0134-8

debian advisories DEBIAN-CVE-2026-8177

  • perl-XML-LibXML RHEL 8 1:2.0132-3.el8_10
  • perl-XML-LibXML RHEL 10.2 1:2.0210-4.el10_2.1
  • perl-XML-LibXML RHEL 9 1:2.0206-5.el9_8.1
  • perl-XML-LibXML RHEL 9.6 EUS 1:2.0206-5.el9_6.1
  • perl-XML-LibXML RHEL 9.2 E4S 1:2.0206-5.el9_2.1
  • perl-XML-LibXML RHEL 9.4 E4S 1:2.0206-5.el9_4.1
  • perl-XML-LibXML enterprise linux eus 10.0 1:2.0210-4.el10_0.1

red hat advisories RHSA-2026:68693RHSA-2026:68688RHSA-2026:68685RHSA-2026:68632RHSA-2026:39878RHSA-2026:39547

  • perl-XML-LibXML SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0132-150000.3.8.1
  • perl-XML-LibXML SLES for SAP applications 16.0, SLES 16.0 2.0210-160000.3.1
  • perl-XML-LibXML SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.0019-6.8.1

suse advisories SUSE-SU-2026:2402-1SUSE-SU-2026:2324-1SUSE-SU-2026:22081-1

  • perl-XML-LibXML openSUSE Leap 16.0 2.0210-160000.3.1
  • perl-XML-LibXML openSUSE Tumbleweed 2.0212-1.1

opensuse advisories openSUSE-SU-2026:20908-1openSUSE-SU-2026:10854-1

  • perl-XML-LibXML AlmaLinux 8 1:2.0132-3.el8_10
  • perl-XML-LibXML AlmaLinux 10 1:2.0210-4.el10_2.1
  • perl-XML-LibXML AlmaLinux 9 1:2.0206-5.el9_8.1

almalinux advisories ALSA-2026:39878ALSA-2026:39547ALSA-2026:39553

  • perl-XML-LibXML Rocky Linux 8 1:2.0132-3.el8_10
  • perl-XML-LibXML Rocky Linux 10 1:2.0210-4.el10_2.1
  • perl-XML-LibXML Rocky Linux 9 1:2.0206-5.el9_8.1

rocky linux advisories RLSA-2026:39878RLSA-2026:39547RLSA-2026:39553

  • perl-XML-LibXML Azure Linux 3.0 2.0209-3

azure linux advisories AZL-86550

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-8177 updated cvss 7.5

perl-XML-LibXML: XML::LibXML: Denial of Service via truncated UTF-8 in XML node names

  • Red Hat Enterprise Linux 6 perl-XML-LibXML
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perl-XML-LibXML
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) perl-XML-LibXML 2.0132-3.el8_10
    fixed: vendor fix RHSA-2026:39878
  • Red Hat Enterprise Linux AppStream (v. 9) perl-XML-LibXML 2.0206-5.el9_8.1
    fixed: vendor fix RHSA-2026:39553
  • Red Hat Enterprise Linux AppStream (v. 10) perl-XML-LibXML 2.0210-4.el10_2.1
    fixed: vendor fix RHSA-2026:39547
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) perl-XML-LibXML 2.0132-2.el8_4.1
    fixed: vendor fix RHSA-2026:93470
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) perl-XML-LibXML 2.0132-2.el8_6.1
    fixed: vendor fix RHSA-2026:92800
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) perl-XML-LibXML 2.0132-2.el8_8.1
    fixed: vendor fix RHSA-2026:92798
show 8 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perl-XML-LibXML 2.0206-5.el9_2.1
    fixed: vendor fix RHSA-2026:68688
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) perl-XML-LibXML 2.0206-5.el9_4.1
    fixed: vendor fix RHSA-2026:68685
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) perl-XML-LibXML 2.0210-4.el10_0.1
    fixed: vendor fix RHSA-2026:68632
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) perl-XML-LibXML 2.0206-5.el9_6.1
    fixed: vendor fix RHSA-2026:68693
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) perl-XML-LibXML 2.0132-2.el8_4.1
    fixed: vendor fix RHSA-2026:93470
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) perl-XML-LibXML 2.0132-2.el8_6.1
    fixed: vendor fix RHSA-2026:92800
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) perl-XML-LibXML 2.0132-2.el8_8.1
    fixed: vendor fix RHSA-2026:92798
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perl-XML-LibXML-debuginfo 2.0206-5.el9_2.1, perl-XML-LibXML-debugsource 2.0206-5.el9_2.1 Red Hat Enterprise Linux AppStream E4S (v.9.4) perl-XML-LibXML-debuginfo 2.0206-5.el9_4.1, perl-XML-LibXML-debugsource 2.0206-5.el9_4.1 Red Hat Enterprise Linux AppStream EUS (v. 10.0) perl-XML-LibXML-debuginfo 2.0210-4.el10_0.1, perl-XML-LibXML-debugsource 2.0210-4.el10_0.1 Red Hat Enterprise Linux AppStream EUS (v.9.6) perl-XML-LibXML-debuginfo 2.0206-5.el9_6.1, perl-XML-LibXML-debugsource 2.0206-5.el9_6.1 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • SHLOMIF XML::LibXML
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

References

Sources

Fencer Vulns 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.