What is CVE-2026-123610?

CVE-2026-123610 is a low-severity vulnerability in Rustls, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 3.7/10. Published 2026-11-08.

How severe is CVE-2026-123610?

Low severity. CVSS v3 base score is 3.7 out of 10.

Resource exhaustion in Rustls

CVE-2026-123610

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.

Published 2026-11-08.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Rustls

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/rustls/rustls/security/advisories/GHSA-h2v8-394m-p7vv (vendor-advisory)
www.vulncheck.com/advisories/rustls-before-0.23.46-denial-of-service-via-brotli… (third-party-advisory)

Frequently asked questions

What is CVE-2026-123610?: CVE-2026-123610 is a low-severity vulnerability in Rustls, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 3.7/10. Published 2026-11-08.
How severe is CVE-2026-123610?: Low severity. CVSS v3 base score is 3.7 out of 10.