---
id: CVE-2026-74994
title: >-
  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
summary: >-
  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 ad…
severity: medium
cvss: 6
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-863
  - CWE-1289
  - CWE-1220
vendor: Erlang
product: otp
affected:
  - otp >= 17.0 < 27.3.4.17
  - otp >= 28.0 < 28.5.0.6
  - otp >= 29.0 < 29.0.6
  - inets >= 5.10 < 9.3.2.7
  - inets >= 9.4 < 9.6.2.3
  - inets >= 9.7 < 9.7.2
  - erlang/otp >= 84adefa331c4159d432d22840663c38f155cd4c1 < *
published: '2026-09-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T02:17:27.360'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74994'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-74994.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/6101cb74ff2870718c622ba7af0c100f7f2524e3
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/6982e381137ede21a4e1faf5fa2dd82321691176
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/c5ccec8ed25c70ec6557fd81277e4b2f52285c19
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/erlang/otp/security/advisories/GHSA-c3cq-q8x6-547g'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-74994'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74994.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-74994'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2526857'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-74994'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74994'
  - url: 'https://access.redhat.com/errata/RHSA-2026:62531'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-01T15:57:45.946562Z'
cvssSource: cna
epss: 0.00633
epssPercentile: 0.48144
ingestedAt: '2026-09-08T15:33:26.957Z'
patched:
  - hardened_images
scores:
  cna: 6
  vendor: 6.5
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:62531** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62531)