Rustls up to 0.23.45 Brotli Decompression allocation of resources

Summaryinfo

A vulnerability categorized as problematic has been discovered in Rustls up to 0.23.45. Affected by this vulnerability is an unknown functionality of the component Brotli Decompression. The manipulation results in allocation of resources. This vulnerability is reported as CVE-2026-123610. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Rustls up to 0.23.45. It has been classified as problematic. Affected is an unknown functionality of the component Brotli Decompression. 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 intended restrictions on the size or number of resources that can be allocated. This is going to have an impact on availability. CVE summarizes:

rustls before 0.23.46 contains an uncontrolled memory allocation flaw in its optional Brotli certificate decompression, which limits decompressed output size but accepts an input-selected large history window. Malicious peers can send a certificate with a five-byte Brotli header requesting up to 1 GiB before authentication, aborting Brotli-enabled clients or client-authenticating servers whose allocator cannot satisfy the request.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-123610 since 11/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 0.23.46 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Rustls

Version

• 0.23.0
• 0.23.1
• 0.23.2
• 0.23.3
• 0.23.4
• 0.23.5
• 0.23.6
• 0.23.7
• 0.23.8
• 0.23.9
• 0.23.10
• 0.23.11
• 0.23.12
• 0.23.13
• 0.23.14
• 0.23.15
• 0.23.16
• 0.23.17
• 0.23.18
• 0.23.19
• 0.23.20
• 0.23.21
• 0.23.22
• 0.23.23
• 0.23.24
• 0.23.25
• 0.23.26
• 0.23.27
• 0.23.28
• 0.23.29
• 0.23.30
• 0.23.31
• 0.23.32
• 0.23.33
• 0.23.34
• 0.23.35
• 0.23.36
• 0.23.37
• 0.23.38
• 0.23.39
• 0.23.40
• 0.23.41
• 0.23.42
• 0.23.43
• 0.23.44
• 0.23.45

Website

• Product: https://github.com/rustls/rustls/

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