CVE-2026-23943: Erlang OTP

Pre-auth SSH DoS via unbounded zlib inflate

CVSS 6.9 MediumEPSS 0.0068 · 52nd percentile

Published by the CVE Program (CNA: EEF) at 13 Mar 2026, 09:11 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: ssh pkg:otp/ssh?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git	affected 3.0.1 to before * otp Other versions: unknown
Erlang	OTP Package name: erlang/otp https://github.com pkg:github/erlang/otp	affected 17.0 to before * otp affected 07b8f441ca711f9812fad9e9115bab3c3aa92f79 to before * git Other versions: unknown

Identifiers

CVE-2026-23943

CNA

EEF

Weakness (CWE)

CWE-409

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
6.9	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	CNA (EEF)

CISA KEV Not listed.
EPSS 0.0068, the 52nd 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 13 Mar 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/erlang/otp/security/advisories/GHSA-c836-qprm-jw9r vendor-advisoryrelated
cna.erlef.org/cves/CVE-2026-23943.html related
osv.dev/vulnerability/EEF-CVE-2026-23943 related
www.erlang.org/doc/system/versions.html#order-of-versions version-scheme
github.com/erlang/otp/commit/43a87b949bdff12d629a8c34146711d9da93b1b1 patch
github.com/erlang/otp/commit/93073c3bd338c60cd2bae715ce6a1d4ffc1a8fd3 patch
github.com/erlang/otp/commit/0c1c04b191f6ab940e8fcfabce39eb5a8a6440a4 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.