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Fencer Vulns
high 7.5

CVE-2026-78384 json

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

published 2026-10-09 31 d ago modified 2026-10-20 20 d 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

  • Apache Software Foundation Apache CXF 3.6.13, 4.1.9, 4.2.4

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
24 d ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 products

  • Apache Software Foundation Apache CXF

Classification

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

References

Sources

Fencer Vulns 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.