CVE-2026-74994— inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth
Quick assessment
Affected
Erlang OTP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
OTP 中 inets httpd 服务器的 模块在配置为使用 dets 或 mnesia 认证后端，并存在多个目录配置块时，会将所有目录块合并到一个共享的用户/组命名空间中。因此，添加到某个受保护目录中的用户，在同一个服务器实例上的其他所有受保护目录中也会被认定为有效用户。 此问题影响以下版本范围： OTP 17.0 至 OTP 27.3.4.17 之前 OTP 28.0 至 OTP 28.5.0.6 之前 OTP 29.0 至 OTP 29.0.6 之前 对应于 inets 组件的版本为： 5.10 至 9.3
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I. Basic Information for CVE-2026-74994
Vulnerability Information
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Vulnerability Title
inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-74994
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-74994 (6)
Same Patch Batch · Erlang · 2026-09-01 · 16 CVEs total
| CVE-2026-71380 | 8.7 HIGH | httpd applies no timeout while receiving a request body, parking a worker on a stalled cli |
| CVE-2026-70399 | 8.7 HIGH | httpd does not enforce the documented default max_clients connection limit |
| CVE-2026-74835 | 8.7 HIGH | inets,httpd: Memory Exhaustion via Unenforced max_body_size During Chunked Body Reception |
| CVE-2026-69664 | 8.7 HIGH | httpd parks a request worker indefinitely on a malformed chunk size sent after the headers |
| CVE-2026-66357 | 8.3 HIGH | inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation |
| CVE-2026-73812 | 8.3 HIGH | inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length |
| CVE-2026-73276 | 8.3 HIGH | inets, httpd: HTTP Request Smuggling via Whitespace-Before-Colon Header Dropping i |
| CVE-2026-55951 | 8.2 HIGH | httpc memory exhaustion via unbounded response header accumulation |
| CVE-2026-75538 | 8.2 HIGH | A Signed Length Overflow in Erlang/OTP's inet TCP Driver Overflows the Receive Buffer Into |
| CVE-2026-66835 | 8.2 HIGH | httpd mod_auth directory protection bypassed by a doubled slash in the request path |
| CVE-2026-73270 | 8.2 HIGH | httpd mod_auth directory protection bypassed by request path casing on case-insensitive fi |
| CVE-2026-59696 | 6.9 MEDIUM | uri_string does not bound the port component of a URI before integer conversion |
| CVE-2026-71562 | 6.3 MEDIUM | httpc does not bound server-supplied numeric header values before integer conversion |
| CVE-2026-70405 | 6.3 MEDIUM | snmp BER INTEGER decoder applies no size limit to attacker-supplied integer fields |
| CVE-2026-70409 | 6.3 MEDIUM | eldap does not bound the port component of a referral URL before integer conversion |
IV. Related Vulnerabilities
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CVE-2026-69664
httpd parks a request worker indefinitely on a malformed chu -
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snmp BER INTEGER decoder applies no size limit to attacker-s -
CVE-2026-66835
httpd mod_auth directory protection bypassed by a doubled sl -
CVE-2026-73270
httpd mod_auth directory protection bypassed by request path
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V. Comments for CVE-2026-74994
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