CVE-2026-74994: Erlang OTP

Medium severity, CVSS 6.0. EPSS: 0.6% chance of exploitation in the next 30 days.

The mod_auth module in OTP's inets httpd server, when configured with dets or mnesia authentication backends and multiple directory configuration blocks, collapses all directory blocks into a single shared user/group namespace. A user added to one protected directory is accepted as valid for all other protected directories on the same server instance. This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.

Affected products

• Erlang OTP: from 17.0, before 27.3.4.17 (fixed in 27.3.4.17); from 28.0, before 28.5.0.6 (fixed in 28.5.0.6); from 29.0, before 29.0.6 (fixed in 29.0.6); from 5.10, before 9.3.2.7 (fixed in 9.3.2.7); from 9.4, before 9.6.2.3 (fixed in 9.6.2.3); from 9.7, before 9.7.2 (fixed in 9.7.2)

Published 2026-09-01. Last modified 2026-09-08.