CVE-2026-42790: Erlang OTP

nameConstraints DNS bypass via subject CommonName fallback in public_key hostname verification

CVSS 7.6 HighEPSS 0.0034 · 28th percentile

Published by the CVE Program (CNA: EEF) at 27 May 2026, 15:09 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: public_key pkg:otp/public_key?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git	affected 1.4 to before * otp Other versions: unknown
Erlang	OTP Package name: erlang/otp https://github.com pkg:github/erlang/otp	affected 19.3 to before * otp affected b0c245e8132bb13171e277b1af59c0cec00c9459 to before * git Other versions: unknown

Identifiers

CVE-2026-42790

CNA

EEF

Weakness (CWE)

CWE-295 · CWE-297

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
7.6	High	4.0	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N	CNA (EEF)Used for this record
7.4	High	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	ADP (redhat-SADP)

CISA KEV Not listed.
EPSS 0.0034, the 28th 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 27 May 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/erlang/otp/security/advisories/GHSA-22cw-4ph4-6447 vendor-advisoryrelated
cna.erlef.org/cves/CVE-2026-42790.html related
osv.dev/vulnerability/EEF-CVE-2026-42790 related
www.erlang.org/doc/system/versions.html#order-of-versions version-scheme
github.com/erlang/otp/commit/0769050c69d73762672b0db1347b6993a5b31759 patch
github.com/erlang/otp/commit/fb67c6d1836f51105a96d8b769e71e4215a79457 patch
github.com/erlang/otp/commit/21abed64eb2026b5f82f432709e4e932f9be389a 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.