Vulnerability details

CVE-2026-78384

Apache Software Foundation Apache CXF

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

CVSS 3.1

7.5High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.5High	3.1	CISA ADP / Vulnrichment (CISA-ADP)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

Affected products

Vendor	Product	Versions	Source
Apache Software Foundation	Apache CXF	v < 3.6.13	CVEProject cvelistV5 (CNA)
Apache Software Foundation	Apache CXF	4.0.0 ≤ v < 4.1.9	CVEProject cvelistV5 (CNA)
Apache Software Foundation	Apache CXF	4.2.0 ≤ v < 4.2.4	CVEProject cvelistV5 (CNA)

References and advisories

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Details

Published: 2026-10-09
Last updated: 2026-10-15
State: Published
Assigner (CNA): apache

Exploit prediction (EPSS)

0.37%

Probability of exploitation in 30 days

31%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

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