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CVE-2026-123610

rustls before 0.23.46 Denial of Service via Brotli Certificate Decompression

CVSS 4.0 6.3 MEDIUMCVSS 3.1 3.7 LOWCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 8 Nov 2026 03:06:35 UTC. Read the latest advisory.

cve-program · CVE-2026-123610

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-123610

Published

rustls

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "rustls",
                    "product": "rustls",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:cargo/rustls",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "0.23.46"
                        },
                        {
                            "version": "0.23.46",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON