CVE-2026-123610

LOW 3.7

rustls before 0.23.46 Denial of Service via Brotli Certificate Decompression

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	rustls
Product	rustls
Published	Nov 8, 2026

Stay Ahead of the Next One

Get instant alerts for rustls rustls

Be the first to know when new low vulnerabilities affecting rustls rustls are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

rustls / rustls

0 < 0.23.46

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/rustls/rustls/security/advisories/GHSA-h2v8-394m-p7vv vulncheck.com: https://www.vulncheck.com/advisories/rustls-before-0.23.46-denial-of-service-via-brotli-certificate-decompression