CVE record · CVE-2026-89422

TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension

CVSS 9.3 CriticalCriticalEPSS 0.0046 · 39th percentile

Critical, because:

CVSS score 9.3: 9.0 or more.

Published by the CVE Program (CNA: EEF) at 22 Sept 2026, 08:49 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Erlang	OTP Package name: otp pkg:software-id/erlang.org/otp	affected 22.2 to before * otp Other versions: unaffected
Erlang	OTP Package name: ssl pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git	affected 9.5 to before * otp Other versions: unaffected
Erlang	OTP Package name: erlang/otp https://github.com pkg:github/erlang/otp	affected 21b8a1b0ad0adf200682b3854bc50114ab2b8c62 to before * git Other versions: unaffected

Identifiers: CVE-2026-89422
CNA: EEF
Weakness (CWE): CWE-322
Tags: Erlang OTP
CWE-322
Published: 22 Sept 2026
Updated: 22 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	CNA (EEF)

CISA KEV Not listed.
EPSS 0.0046, the 39th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 22 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/erlang/otp/security/advisories/GHSA-rgxr-4g4w-j875 relatedvendor-advisory
cna.erlef.org/cves/CVE-2026-89422.html related
osv.dev/vulnerability/EEF-CVE-2026-89422 related
www.erlang.org/doc/system/versions.html#order-of-versions version-scheme
github.com/erlang/otp/commit/21b8a1b0ad0adf200682b3854bc50114ab2b8c62 related
github.com/erlang/otp/commit/afec5156361bb50d3607c7c1a453c19b9149b324 patch
github.com/erlang/otp/commit/98c66c858113949c4262d26cd7d426c4b09d2b35 patch
github.com/erlang/otp/commit/fd1d9d07fc92ec0d59f96dfb66182195882bb7dd patch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.