RUSTSEC-2026-0348: Brotli certificate decompression can allocate up to 1 GiB before authentication

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难度
2/5
预计耗时
1-3 小时
新手友好度
40/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
rust
领域
security

调研方向

The vulnerable crate is rustls 0.23.45, so start in Cargo.lock and the Cargo.toml that pulls it in. Run cargo tree -i rustls -e features to check whether the brotli feature is enabled anywhere in the graph. Then bump rustls to at least 0.23.46 with cargo update -p rustls and confirm with cargo audit. Done when the lockfile resolves to a patched version and the build and tests still pass.

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描述

Brotli certificate decompression can allocate up to 1 GiB before authentication

Details
Package rustls
Version 0.23.45
URL https://github.com/rustls/rustls/pull/3297
Date 2026-10-14
Patched versions >=0.23.46
Unaffected versions <0.23.9

The built-in Brotli certificate decompressor (enabled by the non-default
brotli crate feature) bounded the size of the decompressed output, but
accepted a peer-selected history window. Brotli's large-window extension was
enabled, so a five-byte header could cause an allocation of 1 GiB. A peer can
abort a process whose allocator cannot satisfy that request.

No trusted certificate is required by the attacker. Affected configurations are:

  • clients that enable the brotli feature and connect to a malicious server, and
  • servers that enable the brotli feature and request client certificates.

Applications that do not enable the brotli feature are not affected.

See advisory page for additional details.

主要语言
Rust
星标
11
派生
5
平均合并
1 天 6 小时
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