CVE-2026-102496: Apache XmlSchema doesn't limit how deeply schema structures can be nested when it builds its schema model, so

Q: How do I fix CVE-2026-102496?

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

Q: Is CVE-2026-102496 being exploited?

CVE-2026-102496 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-2026-102496 affect?

CVE-2026-102496 affects xmlschema. Severity is high (CVSS 7.5). Apache XmlSchema doesn't limit how deeply schema structures can be nested when it builds its schema model, so a malicious schema can make parsing recurse until the stack overflows. This causes a denial of service. Users are recommended to u

Q: How urgent is CVE-2026-102496?

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

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-102496 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.

Apache XmlSchema doesn't limit how deeply schema structures can be nested when it builds its schema model, so a malicious schema can make parsing recurse until the stack overflows. This causes 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 14:38 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-2026-102496?

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

Is CVE-2026-102496 being exploited?

CVE-2026-102496 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-2026-102496 affect?

CVE-2026-102496 affects xmlschema. Severity is high (CVSS 7.5). Apache XmlSchema doesn't limit how deeply schema structures can be nested when it builds its schema model, so a malicious schema can make parsing recurse until the stack overflows. This causes a denial of service. Users are recommended to u

How urgent is CVE-2026-102496?

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-2026-102497 HIGH 7.5 UPGRADE The Apache XmlSchema walker (xmlschema-walker) doesn't detect cycles in type derivation, substitution groups,

References

← Back to latest CVEs