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TI-2026-65410 Aliases CVE-2026-102497GHSA-9wgm-rwmh-4mcv

Apache XMLSchema: Denial of service through cyclic schema definitions in the schema walker

Priority LOW 39CWE-674Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-674.

Summary

The Apache XmlSchema walker (xmlschema-walker) doesn't detect cycles in type derivation, substitution groups, model groups or attribute groups. A malicious schema with such a cycle can make the walker recurse until the stack overflows, causing a denial of service. Users are recommended to upgrade to version 2.3.3, which fixes this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00528 44th percentileScored 2026-11-07
Fix Fixed Apache XMLSchema (Apache Software Foundation): 2.3.3

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
ApacheApache XMLSchemabefore 2.3.32.3.3Patch availableCNA
  • Apache XMLSchema VendorApache Affected before 2.3.3 Fixed in 2.3.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:xmlschema:*:*:*:*:*:*:*:*before 2.3.3VulnerableApache
  • cpe:2.3:a:apache:xmlschema:*:*:*:*:*:*:*:* Versions before 2.3.3 Vulnerable ·Apache

Remediation

  • Fix · CNA Apache XMLSchema (Apache Software Foundation) Fixed in 2.3.3

Fixed in the same release

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

  • Release ·

    Apache XMLSchema 2.3.3

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-65409 Apache XMLSchema: Denial of service through deeply nested schema structuresPriority LOW 39
    • TI-2026-65408 Apache XMLSchema: Denial of service through unbounded recursion when resolving schema imports and includesPriority LOW 39
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-102497
  2. 2026-10-03 Alias added: GHSA-9wgm-rwmh-4mcv
  3. 2026-11-07 Affected versions changed · Red Hat
  4. 2026-11-07 CVSS score added · Red Hat

References

Advisory 2

  • TI-2026-65409 Apache XMLSchema: Denial of service through deeply nested schema structures CVSS 3.1HIGH 7.5
  • TI-2026-65408 Apache XMLSchema: Denial of service through unbounded recursion when resolving schema imports and includes CVSS 3.1HIGH 7.5

Sources

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