5.9

CVE-2026-0990: ibm aix Uncontrolled Recursion

CVSS: 5.9v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-0990DEBIAN-CVE-2026-0990
Published 15-01-2026Last modified 01-09-2026
Open JSON

Vulnerability summary

CVE-2026-0990 is a medium (CVSS 5.9) Uncontrolled Recursion vulnerability in ibm aix. EPSS estimates a 0.95% chance of exploitation in the next 30 days, higher than 60.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.95%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 13 · Related 12
MGASA-2026-0027OPENSUSE-SU-2026:10213-1OPENSUSE-SU-2026:20312-1RHSA-2026:7519SUSE-SU-2026:0568-1SUSE-SU-2026:0570-1

Timeline

  1. 15-01-2026
    PublishedVulnerability first disclosed.
  2. 01-09-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.95%

Chance of exploitation in the next 30 days

Percentile

61%

Versus all other CVEs

30-day change

+0.06 pp

From 0.90% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.95%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (gitlab.gnome.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Redhat4 products
Ibm2 products
  • aix≥ 7.2.5, < 7.2.5.12 | ≥ 7.3.2, < 7.3.3.3 | 7.3.4
  • vios≥ 4.1.0, < 4.1.1.30 | 4.1.2.0
Debian1 product
  • libxml2< 2.9.14+dfsg-1.3~deb12u6 | < 2.12.7+dfsg+really2.9.14-2.1+deb13u3 | < 2.15.2+dfsg-0.1
Ubuntu1 product
  • libxml2< 2.9.1+dfsg1-3ubuntu4.13+esm11 | < 2.9.3+dfsg1-1ubuntu0.7+esm12 | < 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | < 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | < 2.9.13+dfsg-1ubuntu0.11 | < 2.9.14+dfsg-1.3ubuntu3.7 | < 2.14.5+dfsg-0.2ubuntu0.1
Xmlsoft1 product

5 vendors · 9 products

References

9 links