Skip to main content
CVE-2026-56411VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Affects Red Hat coin3Source GCVE Database

0
Compare

Mentioned vulnerabilities

Authoritative record:CVE-2026-56411· Medium 6.9

Not known to be exploited · CVSS 6.9 Medium · fixed in Ubuntu package updates : update the Ubuntu expat package when convenient.

Data as of 11 Nov 2026, 23:24 UTC

CVSS 3.1 base score
6.9Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (mitre)CVSS 3.16.9
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.2.5-3ubuntu0.9+esm5, 2.2.9-1ubuntu0.8+esm3, 2.4.7-1ubuntu0.9 +2
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.10cadaverpkg:deb/ubuntu/cadaver?arch=source&distro=stonkingOther threatsAffected
  • =0.28+dfsg-2
Fixed in–
Ubuntu 26.10matanzapkg:deb/ubuntu/matanza?arch=source&distro=stonkingOther threatsAffected
  • =0.13+ds2-2build1
Fixed in–
Ubuntu 26.10swish-epkg:deb/ubuntu/swish-e?arch=source&distro=stonkingOther threatsAffected
  • =2.4.7-7.1
  • =2.4.7-7.2
  • =2.4.7-7.2build1
Fixed in–
Ubuntu 26.10tdompkg:deb/ubuntu/tdom?arch=source&distro=stonkingOther threatsAffected
  • =0.9.6-2
  • =0.9.6-3
Fixed in–
Ubuntu 26.10wbxml2pkg:deb/ubuntu/wbxml2?arch=source&distro=stonkingOther threatsAffected
  • =0.11.10+dfsg-3
  • =0.11.10+dfsg-4
Fixed in–
Ubuntu 26.10xmlrpc-cpkg:deb/ubuntu/xmlrpc-c?arch=source&distro=stonkingOther threatsAffected
  • =1.60.05-1
  • =1.60.05-1build1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update is available and should be applied to affected packages to remediate the vulnerability. Where parsing untrusted XML is necessary, restrict sources using network controls, enforce strict limits on document size, attribute counts, and request rates, and apply execution timeouts to prevent CPU exhaustion. Avoid parsing untrusted XML where possible. The vendor advisory confirms a patch is available and recommends applying it.

Description

A denial of service vulnerability exists in the Expat XML parsing library used in Red Hat Hardened Images RPMs. The flaw is due to inefficient algorithmic complexity in the storeAtts() function when processing XML attributes, which can be triggered remotely by an unauthenticated attacker supplying a specially crafted XML document. This causes excessive CPU consumption and service unavailability. The vulnerability affects applications parsing untrusted XML, including some impacted versions of Red Hat packages. A security update is available to address this issue.

References

Community reviews

Loading reviews…