CVE-2026-78384 — Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompression Bomb)

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Apache Software Foundation / Apache CXF	affected 4.2.0 before 4.2.4; affected 4.0.0 before 4.1.9; affected 0 before 3.6.13

CWE

No CWE identifiers supplied.

References

https://lists.apache.org/thread.html/xoh63rlxn0m9koft5j4jxrfd0hf81v3q

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/10/09/6

CISA-ADP

No English description supplied.

No references supplied.