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.
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Sun, 08 Nov 2026 01:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | rustls before 0.23.46 Denial of Service via Brotli Certificate Decompression | |
| First Time appeared |
Rustls Project
Rustls Project rustls |
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| Weaknesses | CWE-770 | |
| CPEs | cpe:2.3:a:rustls_project:rustls:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Rustls Project
Rustls Project rustls |
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| References |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-11-08T01:38:35.478Z
Reserved: 2026-11-06T01:02:39.794Z
Link: CVE-2026-123610
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