Read the docs
TI-2026-58933 Aliases CVE-2026-86139GHSA-xvw4-gjw8-rw38

In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.

Priority LOW 35CWE-190Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00166 5th percentileScored 2026-11-07
Fix Fixed libxml2 (xmlsoft): 2.15.4Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
xmlsoftlibxml2before 2.15.42.15.4Patch availableCNA
  • libxml2 Vendorxmlsoft Affected before 2.15.4 Fixed in 2.15.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*before 2.15.4Vulnerablexmlsoft
  • cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:* Versions before 2.15.4 Vulnerable ·xmlsoft

Remediation

  • Fix · CNA libxml2 (xmlsoft) Fixed in 2.15.4

Red Hat 1 advisory

  • RHSA-2026:64463 Released 2026-09-06 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images libxml2-16-2.15.4-0.1.hum1@aarch64, libxml2-16-2.15.4-0.1.hum1@x86_64, libxml2-2.15.4-0.1.hum1@aarch64 +8

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    xmlsoft libxml2 2.15.4

    8 records Highest priority Priority LOW 8 LOW

    Other records, highest priority first

    • TI-2026-58934 In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.Priority LOW 36
    • TI-2026-58936 Heap-based buffer overflow in xmlsoft libxml2Priority LOW 35
    • TI-2026-58938 In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do…Priority LOW 33
    Show all 8 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:64463
Not affected: 8 products
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86139
  2. 2026-10-03 Alias added: GHSA-xvw4-gjw8-rw38
  3. 2026-11-06 Affected versions changed · Red Hat

References

Patch 1

Other 1

  • TI-2020-06117 xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file situation. CVSS 3.1HIGH 7.5
  • TI-2025-05441 Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2 CVSS 3.1HIGH 7.5
  • TI-2024-22792 An issue was discovered in xmllint (from libxml2) before 2.11.8 and 2.12.x before 2.12.7. CVSS 3.1HIGH 7.5
  • TI-2017-06514 libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the… CVSS 3.1HIGH 7.5
  • TI-2022-19140 An issue was discovered in libxml2 before 2.10.3. CVSS 3.1HIGH 7.5
  • TI-2025-23491 Out-of-bounds read in xmlsoft libxml2 CVSS 3.1HIGH 7.5
See all 114 →

Sources

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