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Advisory record · GHSA-h2v8-394m-p7vv

Rustls: Brotli certificate decompression can allocate an attacker-controlled amount of memory up to 1 GiB before authentication.

CVSS 3.7 Low

Published by the GitHub Advisory Database at 27 Oct 2026, 16:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
rustlscrates.io<0.23.46 || >=0.24.0-dev.1, <0.24.0-dev.20.23.46, 0.24.0-dev.2
Identifiers
GHSA-h2v8-394m-p7vv · RUSTSEC-2026-0348
Weakness (CWE)
CWE-770
Tags
Published
27 Oct 2026
Updated
27 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The rustls crate versions below 0.23.46, and 0.24.0-dev.1 only, are affected; the issue is fixed in 0.23.46 and 0.24.0-dev.2. The Brotli certificate decoder, which is disabled by default, accepts an input-selected history window, so a peer sending a crafted certificate can force a 1 GiB allocation and crash a process whose allocator cannot satisfy it. Exploitation requires the application to enable the brotli feature and connect to a malicious peer, or for a server to request client certificates. Upgrade to 0.23.46 or 0.24.0-dev.2.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
3.7 Low 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.