Vulnerability · Published Jul 22, 2025 · Assigned by GitHub_M
CVE-2025-53538Suricata's mishandling of data on HTTP2 stream 0 can lead to resource starvation
High 7.5
In plain English
A high-severity resource allocation without limits in suricata from OISF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | suricata | 1:7.0.10-1+deb13u1 | DEBIAN-CVE-2025-53538 |
| Debian:14 | suricata | 1:7.0.11-1 | DEBIAN-CVE-2025-53538 |
| Ubuntu:22.04:LTS | suricata | no fix listed | UBUNTU-CVE-2025-53538 |
| Ubuntu:24.04:LTS | suricata | no fix listed | UBUNTU-CVE-2025-53538 |
| Ubuntu:25.10 | suricata | no fix listed | UBUNTU-CVE-2025-53538 |
| Ubuntu:26.04:LTS | suricata | no fix listed | UBUNTU-CVE-2025-53538 |
| Ubuntu:26.10 | suricata | no fix listed | UBUNTU-CVE-2025-53538 |
Affected products (as reported)
Weakness: CWE-770, CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H