CVE-2026-74994: inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth

Medium severity · published Sep 1, 2026

CVE-2026-74994

inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth

6.0

CVSS

0.6%

EPSS

On KEV

Description

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.

Exploitation

Is it being used?

Exploit prediction (EPSS)0.6% · higher than 50% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

OTP · Erlang

17.0 before 27.3.4.17; 28.0 before 28.5.0.6; 29.0 before 29.0.6; 5.10 before 9.3.2.7; 9.4 before 9.6.2.3; 9.7 before 9.7.2; +1 more · source: vendor

Affected product

OTP