CVE-2026-70469

Apache NiFi 2.11.0 disabled support for gzip-encoded HTTP requests for the application REST API and rejected requests that included the standard Content-Encoding header indicating gzip encoding. The framework enforcement filter did not check multiple instances of the Content-Encoding header and did not reject non-standard identifiers for gzip encoding, allowing a malicious client to send crafted requests that could consume excessive amounts of memory. Upgrading to Apache NiFi 2.12.0 is the recommended mitigation, which disables decompression of gzip-encoded HTTP requests regardless of header number or encoding identifiers.

• https://lists.apache.org/thread/mjpv7r4djgn7fdvhnpjwgr2rcto47mx0Mailing List
• http://www.openwall.com/lists/oss-security/2026/09/16/7Mailing List