Severity: moderate Affected versions:
- Apache CXF (org.apache.cxf:cxf-core) 4.2.0 before 4.2.4 - Apache CXF (org.apache.cxf:cxf-core) 4.0.0 before 4.1.9 - Apache CXF (org.apache.cxf:cxf-core) before 3.6.13 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. Credit: Guanping Zhang reported this vulnerability. (finder) References: https://cxf.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-78384
