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CVE-2026-73270— httpd mod_auth directory protection bypassed by request path casing on case-insensitive filesystems

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.

Erlang/OTP是Erlang/OTP团队开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 17.0版本至27.3.4.17之前版本、28.0版本至28.5.0.6之前版本和29.0版本至29.0.6之前版本存在输入验证错误漏洞，该漏洞源于mod_auth模块的secret_path/3函数在路径检查时未使用caseless选项，导致大小写处理不当，在大小写不敏感的文件系统上，远程未认证攻击者通过请求不同大小写的路径可绕过认证

CVSS 8.2 · High EPSS 0.93% · P60

Possible ATT&CK Techniques 1 AI

T1079

Affected Version Matrix 9

VendorProduct Version RangeStatus
Erlang OTP < 17.0 unknown
17.0< 27.3.4.17 affected
28.0< 28.5.0.6 affected
29.0< 29.0.6 affected
< 5.10 unknown
5.10< 9.3.2.7 affected
9.4< 9.6.2.3 affected
9.7< 9.7.2 affected
… +1 more rows
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I. Basic Information for CVE-2026-73270

Vulnerability Information
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Vulnerability Title
httpd mod_auth directory protection bypassed by request path casing on case-insensitive filesystems
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Handling of Case Sensitivity vulnerability in Erlang/OTP inets httpd allows a remote unauthenticated attacker to read files inside a mod_auth protected directory by requesting them with different casing, on deployments whose filesystem is case-insensitive. mod_auth:secret_path/3 decides whether a resolved filesystem path lies inside a protected directory block by running the configured directory path through re:run/3 without the caseless option. A request for /secret/file against a directory configured as /Secret therefore does not match, so the request is treated as unprotected and no authentication challenge is issued, while the filesystem resolves the differently cased path to the same file and mod_get serves it. Deployments on case-sensitive filesystems are unaffected, because there the filesystem itself rejects the mismatched casing. 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:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang/OTP 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang/OTP是Erlang/OTP团队开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 17.0版本至27.3.4.17之前版本、28.0版本至28.5.0.6之前版本和29.0版本至29.0.6之前版本存在输入验证错误漏洞，该漏洞源于mod_auth模块的secret_path/3函数在路径检查时未使用caseless选项，导致大小写处理不当，在大小写不敏感的文件系统上，远程未认证攻击者通过请求不同大小写的路径可绕过认证
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Erlang OTP 17.0 ~ 27.3.4.17 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 5.10 ~ 9.3.2.7 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 84adefa331c4159d432d22840663c38f155cd4c1 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-73270

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III. Intelligence Information for CVE-2026-73270

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Patches & Fixes for CVE-2026-73270 (3)

Vendor Advisories for CVE-2026-73270 (1)

Other References for CVE-2026-73270 (2)

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-2026-59696 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
CVE-2026-74994 6.0 MEDIUM inets, httpd: Authentication Bypass via Directory Namespace Collapse in httpd mod_auth

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-178