CVE-2026-78384

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.

• CWE-409

• https://lists.apache.org/thread.html/xoh63rlxn0m9koft5j4jxrfd0hf81v3qIssue Tracking, Vendor Advisory
• https://www.openwall.com/lists/oss-security/2026/10/09/6Mailing List, Third Party Advisory

Published

Oct 9, 2026

Last Modified

Oct 20, 2026

Status

Analyzed

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