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.
History

Tue, 20 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:*

Thu, 15 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}


Sat, 10 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-409
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important


Fri, 09 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
References

Fri, 09 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache cxf
Vendors & Products Apache
Apache cxf

Fri, 09 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-399
CWE-788

Fri, 09 Oct 2026 10:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompression Bomb)
References

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published: 2026-10-09T10:18:00.617Z

Updated: 2026-10-15T16:16:44.354Z

Reserved: 2026-08-24T13:44:56.686Z

Link: CVE-2026-78384

cve-icon Vulnrichment

Updated: 2026-10-09T11:07:58.947Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-09T11:17:02.937

Modified: 2026-10-20T12:43:34.747

Link: CVE-2026-78384

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-09T10:18:00Z

Links: CVE-2026-78384 - Bugzilla