CVE-2026-0990Public exploitNetwork attack vector

Application crash via self-referencing catalog recursion

Published Jan 15, 2026 · Updated Jan 15, 2026

Uncontrolled recursion in libxml2 before 2.15.2 allows remote attackers to crash applications with a self-referencing XML catalog. xmlCatalogXMLResolveURI recursively resolves the same delegate URI entry without detecting that its catalog points back to itself. Exposure requires an application to process an attacker-supplied XML catalog containing the cycle; stack exhaustion ends in a segmentation fault.

CVSS severity5.9
Medium
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in libxml2 before 2.15.2 allows remote attackers to crash applications with a self-referencing XML catalog. xmlCatalogXMLResolveURI recursively resolves the same delegate URI entry without detecting that its catalog points back to itself. Exposure requires an application to process an attacker-supplied XML catalog containing the cycle; stack exhaustion ends in a segmentation fault.

The record

CVE
CVE-2026-0990
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
389 Directory Server
Product
Red Hat JBoss Core Services
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat JBoss Core ServicesAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

5.9Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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