OISF suricata up to 7.0.10/8.0.0-rc1 HTTP/2 allocation of resources

Summaryinfo

A vulnerability classified as critical was found in OISF suricata up to 7.0.10/8.0.0-rc1. This affects an unknown part of the component HTTP2 Handler. The manipulation results in allocation of resources. This vulnerability is reported as CVE-2025-53538. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in OISF suricata up to 7.0.10/8.0.0-rc1. Affected is an unknown function of the component HTTP2 Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-53538 since 07/02/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 253497 (TencentOS Server 4: suricata (TSSA-2025:0649)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 7.0.11 or 8.0.0 eliminates this vulnerability. Applying the patch 1d6d331752e933c46aca0ae7a9679b27462246e3 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (253497) and EUVD (EUVD-2025-22378). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• OISF

Name

• suricata

Version

• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 8.0.0-rc1

License

• open-source

Website

• Product: https://github.com/OISF/suricata/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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