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CVE-2026-66357— inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation

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.

httpd 从未实现 obs-fold（RFC 2616 §2.2 / RFC 7230 §3.2.4 中的标题续行）。在 httpd 中，每一个由 CRLF 后紧跟非 CRLF 八位组的序列都会被无条件地视为一个新标题的开始。这一功能缺失在 HTTP 请求走私（request smuggling）攻击的理解不断深化的背景下，逐渐成为一个安全关注点。 该问题影响以下版本的 OTP： OTP 17.0 至 OTP 27.3.4.17 之前的版本； OTP 28.0 至 OTP 28.5.0.6 之前的版本； OTP

CVSS 8.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-66357

Vulnerability Information
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Vulnerability Title
inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5

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-2026-66357

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III. Intelligence Information for CVE-2026-66357

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Other References for CVE-2026-66357 (6)

Same Patch Batch · Erlang · 2026-09-01 · 8 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-2026-73812 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-2026-59696 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

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-444

V. Comments for CVE-2026-66357

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