CVE-2026-66357
inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
httpd has never implemented obs-fold (RFC 2616 §2.2 / RFC 7230 §3.2.4 header continuation lines). Every CRLF followed by a non-CRLF octet unconditionally starts a new header. This missing feature became a security concern as the understanding of HTTP request smuggling attacks evolved. 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.
| CWE | CWE-444 |
| Vendor | erlang |
| Product | otp |
| Published | Sep 1, 2026 |
| Last Updated | Sep 1, 2026 |
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Affected Versions
Erlang / OTP
17.0 < 27.3.4.17 28.0 < 28.5.0.6 29.0 < 29.0.6
Erlang / OTP
5.10 < 9.3.2.7 9.4 < 9.6.2.3 9.7 < 9.7.2
Erlang / OTP
84adefa331c4159d432d22840663c38f155cd4c1 < *
References
github.com: https://github.com/erlang/otp/security/advisories/GHSA-qh2f-33hj-37qf cna.erlef.org: https://cna.erlef.org/cves/CVE-2026-66357.html osv.dev: https://osv.dev/vulnerability/EEF-CVE-2026-66357 github.com: https://github.com/erlang/otp/commit/220d618d2479a7180b4a06d0c5aacfaa4af4a85b github.com: https://github.com/erlang/otp/commit/273d8958de38ff2a7fe0c5dcc5b6bfe6f65717f3 github.com: https://github.com/erlang/otp/commit/e640d599287d2eba919e6f13b91f042d7dbe6ff4
Credits
Lukas Backström / Erlang Solutions Konrad Pietrzak / Ericsson