Is there a public exploit for CVE-2026-66835?

No public exploit for CVE-2026-66835 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-66835?

CVE-2026-66835 scores CVSS 8.2 (v4.0), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.97%.

What does CVE-2026-66835 affect?

CVE-2026-66835 affects erlang otp.

8.2 High

Path Equivalence vulnerability in Erlang/OTP inets httpd allows a remote unauthenticated attacker to read files inside a modauth protected…

CVE-2026-66835

Path Equivalence vulnerability in Erlang/OTP inets httpd allows a remote unauthenticated attacker to read files inside a modauth protected directory by prefixing the request path with an extra slash. httpdrequest:validateuri/1 normalises the request URI with uristring:normalize/1, which performs RFC 3986 dot-segment removal but does not collapse empty path segments, so a doubled slash survives. modalias:realname/3 concatenates the document root with that URI, and modauth:secretpath/3 then decides whether the result lies inside a protected directory block by running the configured directory path as an unanchored regular expression against it. The doubled slash breaks the contiguous substring the regex needs, so the request is treated as unprotected and no authentication challenge is issued, while modget opens the same path and the operating system collapses the doubled slash and returns the protected file. The same path mismatch also evades the per-path accounting in modsecurity. 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…

Assessment

CVSS: 8.2 (v4.0)
Severity: High
EPSS: 0.97% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 1 September 2026
Last updated: 11 November 2026
Affected: erlang · otp
Assigner: EEF

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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