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Fencer Intel
high 7.5

CVE-2026-78384 json

Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompression Bomb)

published last mo. modified 22d ago also EUVD-2026-95696

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

CompressionUtils.inflate() decompressed attacker-controlled DEFLATE data with no output-size cap. A small (~KB) crafted payload could expand to gigabytes on the heap. Reachable via JWE decryption when zip=DEF (e.g. JoseSessionTokenProvider with RSA-OAEP key wrap) and via SAML redirect/POST binding token inflation — in both cases decompression happens before/independent of trust validation.

Fix: Added a configurable maximum inflated-size cap (default 10 MiB, org.apache.cxf.compression-max-inflated-size system property) to CompressionUtils.inflate(); aborts with DataFormatException once exceeded. Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

Patch / fix

  • maven org.apache.cxf:cxf-core 3.6.13, 4.1.9, 4.2.4
  • Apache Software Foundation Apache CXF 3.6.13, 4.1.9, 4.2.4

Is CVE-2026-78384 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-78384 updated cvss 7.5

org.apache.cxf/cxf-core: Apache CXF: Denial of Service via uncontrolled data decompression

  • Red Hat build of Apache Camel 4 for Quarkus 3 cxf-core 4.1.7.rhbac-redhat-00003 Red Hat build of Apache Camel for Spring Boot 4 cxf-core 4.1.7.rhbac-redhat-00003
    affected: workaround, no fix available
  • Red Hat JBoss Enterprise Application Platform 7 cxf-core 4.1.7.rhbac-redhat-00003, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat JBoss Enterprise Application Platform 8 cxf-core 4.1.7.rhbac-redhat-00003
    affected: workaround, no fix available
  • Red Hat JBoss Web Server 5 cxf-core 4.1.7.rhbac-redhat-00003
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Single Sign-On 7 cxf-core 4.1.7.rhbac-redhat-00003
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Build of Apache Camel 3.33.4.SP3 cxf-core 4.1.9.rhbac-redhat-00001
    fixed: vendor fix RHSA-2026:95622
  • Red Hat Build of Apache Camel 3.33.4.SP3 jimfs 1.1, jna 5.8.0, bcel 6.7.0, gax 2.74.1, icu4j 78.2, joni 2.2.6, +1616 more
    not affected: vulnerable code not present
  • Red Hat Fuse 7 cxf-core 4.1.7.rhbac-redhat-00003
    not affected: vulnerable code not in execute path
show 1 more
  • Red Hat JBoss Enterprise Application Platform Expansion Pack cxf-core 4.1.7.rhbac-redhat-00003
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
27d ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.cxf:cxf-core
>=4.2.0, <4.2.4
>=4.0.0, <4.1.9
<3.6.13
4.2.4
4.1.9
3.6.13

Affected products

  • Apache Software Foundation Apache CXF

Classification

Weakness
  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.