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

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Summary

CVECVE-2026-8177
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-10 21:16:30 UTC
Updated2026-07-15 14:18:35 UTC
DescriptionXML::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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006290000 probability, percentile 0.461250000 (date 2026-07-19)

Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read | CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPCVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SHLOMIF XMLLibXML affected 2.0210 custom Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 1:2.0210-4.el10_2.1 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 1:2.0206-5.el9_8.1 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
ADP Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:39553 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
www.openwall.com/lists/oss-security/2026/05/10/8 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8177.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
github.com/cpan-authors/XML-LibXML/issues/146 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
access.redhat.com/security/cve/CVE-2026-8177 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
www.openwall.com/lists/oss-security/2026/05/11/2 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
github.com/cpan-authors/XML-LibXML/commit/15652bd905a6c9dda59a81b14d4766... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
access.redhat.com/errata/RHSA-2026:39547 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/cpan-authors/XML-LibXML/pull/149 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
access.redhat.com/errata/RHSA-2026:39878 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-05-08T00:00:00.000ZPatch submitted in upstream PR.
ADP2026-05-10T22:00:53.601ZReported to Red Hat.
ADP2026-05-10T20:48:51.816ZMade public.

Solutions

CNA: Upgrade to a future XML::LibXML release, or apply the upstream patch.

ADP: RHSA-2026:39547: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:39878: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:39553: Red Hat Enterprise Linux AppStream (v. 9)

Workarounds

ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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