CVE-2026-66357

HighCVSS 8.3/10Last modified Nov 11, 2026

Description

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, 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.

Metrics

CVSS 4.0 8.3/10

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weakness enumeration

CWE-444

Affected software

Vendor	Product	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

Timeline

Published: Sep 1, 2026
Last modified: Nov 11, 2026
NVD status: Deferred

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