CVE-2026-102497: The Apache XmlSchema walker (xmlschema-walker) doesn't detect cycles in type derivation, substitution groups,

Q: How do I fix CVE-2026-102497?

xmlschema: upgrade to 2.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-102497 being exploited?

CVE-2026-102497 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-102497 affect?

CVE-2026-102497 affects xmlschema. Severity is high (CVSS 7.5). 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, caus

Q: How urgent is CVE-2026-102497?

Priority 47/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-102497 is a high-severity flaw (CVSS 7.5) affecting xmlschema. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-09-29
Last modified	2026-10-06

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-29 12:17 UTCPublished CVE record published
2026-10-06 14:37 UTCUpdated Record last modified

apache xmlschema UPGRADE

Affected: < 2.3.3

Fixed in: 2.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy xmlschema || rpm -q xmlschema || xmlschema --version

2. UPGRADE to 2.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xmlschema

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xmlschema

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-102497?

xmlschema: upgrade to 2.3.3. Exact commands for each OS are on this page.

Is CVE-2026-102497 being exploited?

CVE-2026-102497 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-102497 affect?

CVE-2026-102497 affects xmlschema. Severity is high (CVSS 7.5). 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, caus

How urgent is CVE-2026-102497?

Priority 47/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2026-102495 HIGH 7.5 UPGRADE Apache XmlSchema doesn't limit how deeply schema imports and includes can be nested, so a malicious schema can
CVE-2026-102496 HIGH 7.5 UPGRADE Apache XmlSchema doesn't limit how deeply schema structures can be nested when it builds its schema model, so

References

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