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TI-2026-85581 Aliases CVE-2026-123202GHSA-mwvf-r58x-mh9m

Stack-based buffer overflow in libnxml XML parser

Priority MEDIUM 45CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

libnxml versions before 0.18.6 are affected. A stack-based buffer overflow (CWE-121) in the XML parser writes past a 1024-byte stack buffer when an XML name is long and ends in a multi-byte UTF-8 character. A remote attacker with no privileges can supply an XML or RSS feed containing such a name to crash applications that parse it.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

libnxml before 0.18.6 contains a stack-based buffer overflow vulnerability in src/nxml_parser.c that allows remote attackers to write past a 1024-byte stack buffer via long XML names. Attackers can supply XML or RSS feeds with a 1022-character element, attribute, DOCTYPE or entity name ending in a multi-byte UTF-8 character to crash parsing applications.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00705 53rd percentileScored 2026-11-07
Fix Fixed libnxml (bakulf): 0.18.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
bakulflibnxmlbefore 0.18.60.18.6Patch availableCNA
  • libnxml Vendorbakulf Affected before 0.18.6 Fixed in 0.18.6 Patch available CNA

Remediation

Upgrade libnxml to version 0.18.6, which fixes this flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA libnxml (bakulf) Fixed in 0.18.6

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-11-05 Threatist record created from CVE-2026-123202
  2. 2026-11-05 CISA SSVC decision points changed
  3. 2026-11-05 Alias added: GHSA-mwvf-r58x-mh9m
  4. 2026-11-06 Affected versions changed · Red Hat
  5. 2026-11-06 CVSS score added · Red Hat

References

Patch 1

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences