# CVE-2025-53538: suricata: Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Su...

CVE-2025-53538 is fixed in suricata on 1 platform, first by DEBIAN-CVE-2025-53538, released July 22, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-53538
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0054
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 22, 2025

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | suricata Debian 13.5 (trixie) | 1:7.0.10-1+deb13u1 | [DEBIAN-CVE-2025-53538](https://patchblox.com/security/data/fix/linux/debian-cve-2025-53538.md) | Jul 22, 2025 |
| Linux | suricata Debian 14 | 1:7.0.11-1 | [DEBIAN-CVE-2025-53538](https://patchblox.com/security/data/fix/linux/debian-cve-2025-53538.md) | Jul 22, 2025 |

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