CVE-2025-53538

Suricata's mishandling of data on HTTP2 stream 0 can lead to resource starvation

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.04%
Affected: OISF suricata
Published at:
Updated at:

References

Link Tags
https://github.com/OISF/suricata/security/advisories/GHSA-qrr7-crgj-cmh3
https://github.com/OISF/suricata/commit/1d6d331752e933c46aca0ae7a9679b27462246e3
https://github.com/OISF/suricata/commit/7fa88ea9e7d05e07a7864050cfd836b576669720

Frequently Asked Questions

What is the severity of CVE-2025-53538?
CVE-2025-53538 has been scored as a high severity vulnerability.
How to fix CVE-2025-53538?
To fix CVE-2025-53538, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-53538 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-53538 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-53538?
CVE-2025-53538 affects OISF suricata.
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