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CVE-2026-0990

Libxml2: libxml2: denial of service via uncontrolled recursion in xml catalog processing

No known exploitation. EPSS puts it in the 62nd percentile. Fixed versions are out.

CVSS 3.15.9MediumEPSS percentile62nd1.0% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix5 products4 fixed builds listed below
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OpenVAS · 36 checks

e.g. OID 1.3.6.1.4.1.25623.1.0.118848

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Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Red Hat Hardened ImagesFixed builds2.15.2-0.3.hum1Stated by: CVE record
  • Ibm ViosAffected: ≥ 4.1.0, < 4.1.1.30Upgrade to: 4.1.1.30Stated by: NVD
  • Ibm AixAffected: ≥ 7.2.5, < 7.2.5.12Upgrade to: 7.2.5.12Stated by: NVD
  • Xmlsoft Libxml2Affected: < 2.15.2Upgrade to: 2.15.2Stated by: NVD
  • ООО «РусБИТех-Астра» Astra Linux Special EditionAffected: 1.7Upgrade to: not statedStated by: BDU

Versions as the sources state them. 3 more products have version data. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references itself. A remote attacker could exploit this configuration-dependent issue by providing a specially crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a segmentation fault, causing a Denial of Service (DoS) by crashing affected applications.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS62nd
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

1.0% chance of exploitation activity in the next 30 days, which ranks it in the 62nd percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

22 events over 295 days, from the signal feeds we watch.

  1. Patch availableworkaround available, record updated
  2. Patch availableworkaround available, record updated
  3. Patch availableworkaround available, record updated
  4. Patch availableworkaround available, record updated
  5. Patch availableworkaround available, record updated
  6. Patch availableworkaround available, record updated

Affected products

And 8 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Scored 5.9 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality NoneNo confidentiality impact
  • Integrity NoneNo integrity impact
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 8 more references. See all after sign-in

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