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CVE-2026-66357

inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation

Published: Sep 1, 2026Updated: Sep 8, 2026 Sources: CVE List NVDCWE-444
N/ACVSS
NVD MITRE
EPSS Score
0.3%
Top 73.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

Weaknesses

CWE-444

Affected Products

Erlang
oss-projectaka otp, erlang/otp, erlang/ssh
OTPLibraryLibrary
OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://github.com/erlang/otp/security/advisories/GHSA-qh2f-33hj-37qf
github.com
https://cna.erlef.org/cves/CVE-2026-66357.html
cna.erlef.org
https://osv.dev/vulnerability/EEF-CVE-2026-66357
osv.dev
and 3 more references View all →
News mentions
1

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