CVE-2026-74994

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 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 Software

VendorProductVersion RangeStatus
ErlangOTP0 < 17.0unknown
ErlangOTP17.0 < 27.3.4.17affected
ErlangOTP28.0 < 28.5.0.6affected
ErlangOTP29.0 < 29.0.6affected
ErlangOTP0 < 5.10unknown
ErlangOTP5.10 < 9.3.2.7affected
ErlangOTP9.4 < 9.6.2.3affected
ErlangOTP9.7 < 9.7.2affected
ErlangOTP84adefa331c4159d432d22840663c38f155cd4c1 < *affected

Weaknesses

  • CWE-863: CWE-863 Incorrect Authorization
  • CWE-1289: CWE-1289 Improper Validation of Unsafe Equivalence in Input

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References