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VulnerabilityPublished

CVE-2026-102497: Apache XMLSchema · CWE-674

Affects Apache XMLSchemaSource CVE Database V5

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Not known to be exploited · CVSS 7.5 High : upgrade to 2.3.3 soon.

Data as of 12 Nov 2026, 23:24 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 45% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.3.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade Apache to 2.3.3.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache XMLSchemaAffected
  • <2.3.3
Fixed in
  • 2.3.3
MavenApache Software Foundation/org.apache.ws.xmlschema:xmlschema-walkerpkg:maven/Apache Software Foundation/org.apache.ws.xmlschema:xmlschema-walkerOther threatsAffected
  • <2.3.3
Fixed in
  • 2.3.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Apache XMLSchema to version 2.3.3 or later, where this vulnerability is fixed. No other mitigation is indicated by the vendor advisory.

Description

CVE-2026-102497 is a denial of service vulnerability in Apache XMLSchema's xmlschema-walker component. The walker does not detect cycles in type derivation, substitution groups, model groups, or attribute groups, which can cause recursive stack overflow. This issue is fixed in Apache XMLSchema version 2.3.3. Users running versions prior to 2.3.3 are vulnerable to this denial of service attack.

References

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