CVEvulnerability
CVE-2026-66357
8.3 HIGH
Official page ↗
- Status
- Deferred
- Published
- 2026-09-01
- Last modified
- 2026-09-08
- Assigner
- 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
- CVSS 4.0 (6b3ad84c-e1a6-4bf7-a703-f496b71e49db)
- 8.3 HIGH — 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
- Weaknesses
- CWE-444
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, 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.
Related
Weakness · CWE (1)
- CWE-444 Inconsistent Interpretation of HTTP Requests weakness
References
- https://cna.erlef.org/cves/CVE-2026-66357.html cna.erlef.org
- 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 github.com
- https://github.com/erlang/otp/security/advisories/GHSA-qh2f-33hj-37qf github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-66357 osv.dev