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VulnerabilityPublished

CVE-2026-57819: Apache CXF · Uncontrolled Resource Consumption

Affects Apache CXFSource CVE Database V5

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Not known to be exploited · CVSS 7.5 High · fixed in 4.2.3 : patch Apache CXF soon.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 54% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.2.3, 4.1.8, 3.6.12
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Aug 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 5 Nov 2026.

What to do

Upgrade Apache to 4.2.3, 4.1.8 or 3.6.12.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache CXFAffected
  • >=4.2.0 <4.2.3
Fixed in
  • 4.2.3
Apache Software FoundationApache CXFAffected
  • >=4.0.0 <4.1.8
Fixed in
  • 4.1.8
Apache Software FoundationApache CXFAffected
  • <3.6.12
Fixed in
  • 3.6.12
MavenApache Software Foundation/org.apache.cxf:cxf-rt-frontend-jaxrspkg:maven/Apache Software Foundation/org.apache.cxf:cxf-rt-frontend-jaxrsOther threatsAffected
  • >=4.2.0 <4.2.3
  • >=4.0.0 <4.1.8
  • <3.6.12
Fixed in
  • 4.2.3
  • 4.1.8
  • 3.6.12

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

AI-suggested

Users should upgrade Apache CXF to version 4.2.3, 4.1.8, or 3.6.12 or later, where a default limit of 500 form parameters is enforced. This official fix mitigates the risk of denial of service due to uncontrolled resource consumption. No other mitigation is indicated by the vendor advisory.

Description

Apache CXF versions prior to 4.2.3, 4.1.8, and 3.6.12 do not set a default limit on the number of form parameters in JAX-RS messages. This lack of a default limit can lead to uncontrolled resource consumption, potentially causing denial of service (DoS) conditions when processing requests with very large numbers of form parameters. The issue is addressed by introducing a default limit of 500 parameters in the fixed versions.

References

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