CVE-2026-74994
inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth
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, OTP 28.5.0.6, and OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, 9.6.2.3, and 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: EEFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: EEFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: EEFAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| OTP Erlang otp
software-id |
≥ 17.0; < * (affected, otp); unaffected at 27.3.4.17; unaffected at 28.5.0.6; unaffected at 29.0.6
Other versions: unknown |
CNA: EEF |
| OTP Erlang inets
otp |
≥ 5.10; < * (affected, otp); unaffected at 9.3.2.7; unaffected at 9.6.2.3; unaffected at 9.7.2
Other versions: unknown |
CNA: EEF |
| OTP Erlang erlang/otp
github |
≥ 84adefa331c4159d432d22840663c38f155cd4c1; < * (affected, git); unaffected at 6982e381137ede21a4e1faf5fa2dd82321691176; unaffected at c5ccec8ed25c70ec6557fd81277e4b2f52285c19; unaffected at 6101cb74ff2870718c622ba7af0c100f7f2524e3 ≥ 6982e381137ede21a4e1faf5fa2dd82321691176; < * (unaffected, git) ≥ c5ccec8ed25c70ec6557fd81277e4b2f52285c19; < * (unaffected, git) ≥ 6101cb74ff2870718c622ba7af0c100f7f2524e3; < * (unaffected, git) Other versions: unknown |
CNA: EEF |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.0 medium |
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 | CNA: EEF |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/erlang/otp/security/advisories/GHSA-c3cq-q8x6-547gCNA: EEF · vendor-advisory
- https://cna.erlef.org/cves/CVE-2026-74994.htmlCNA: EEF · related
- https://osv.dev/vulnerability/EEF-CVE-2026-74994CNA: EEF · related
- https://www.erlang.org/doc/system/versions.html#order-of-versionsCNA: EEF · x_version-scheme
- https://github.com/erlang/otp/commit/6982e381137ede21a4e1faf5fa2dd82321691176CNA: EEF · patch
- https://github.com/erlang/otp/commit/c5ccec8ed25c70ec6557fd81277e4b2f52285c19CNA: EEF · patch
- https://github.com/erlang/otp/commit/6101cb74ff2870718c622ba7af0c100f7f2524e3CNA: EEF · patch
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