CVE-2025-53538

Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. In versions 7.0.10 and below and 8.0.0-beta1 through 8.0.0-rc1, mishandling of data on HTTP2 stream 0 can lead to uncontrolled memory usage, leading to loss of visibility. Workarounds include disabling the HTTP/2 parser, and using a signature like drop http2 any any -> any any (frame:http2.hdr; byte_test:1,=,0,3; byte_test:4,=,0,5; sid: 1;) where the first byte test tests the HTTP2 frame type DATA and the second tests the stream id 0. This is fixed in versions 7.0.11 and 8.0.0.

• CWE-400
• CWE-770

• https://github.com/OISF/suricata/commit/1d6d331752e933c46aca0ae7a9679b27462246e3Patch
• https://github.com/OISF/suricata/commit/7fa88ea9e7d05e07a7864050cfd836b576669720Patch
• https://github.com/OISF/suricata/security/advisories/GHSA-qrr7-crgj-cmh3Patch, Third Party Advisory

Published

Jul 22, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

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