Am I affected?
type your erlang.org/otp version to check
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.
Weaknesses & attack patterns
Weakness
CWE-444
·
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
in catalog →
MITRE ↗
Attack patterns
CAPEC-33
·
HTTP Request Smuggling
MITRE ↗
Affected — Erlang
<
17.0
status unknown
≥
17.0
<
27.3.4.17
affected
maint-28
≥
28.0
<
28.5.0.6
affected
maint-29
≥
29.0
<
29.0.6
affected
every other version:
unaffected
cpe
cpe:2.3:a:erlang:erlang/otp:*:*:*:*:*:*:*:*
Affected — pkg:otp/inets Repository ↗
<
5.10
status unknown
≥
5.10
<
9.3.2.7
affected
≥
9.4
<
9.6.2.3
affected
≥
9.7
<
9.7.2
affected
every other version:
unaffected
cpe
cpe:2.3:a:erlang:erlang/otp:*:*:*:*:*:*:*:*
Affected — GitHub / erlang/otp Repository ↗
≥
84adefa
and up
affected
→
220d618
not affected
→
273d895
not affected
→
e640d59
not affected
every other version:
unaffected
cpe
cpe:2.3:a:erlang:erlang/otp:*:*:*:*:*:*:*:*
References
github.com/erlang/otp ·
GHSA-qh2f-33hj-37qf ↗
vendor-advisory
osv.dev ·
EEF-CVE-2026-66357 ↗
related
Credits
Lukas Backström / Erlang Solutions
Finder
Konrad Pietrzak / Ericsson
Remediation developer
CVSS breakdown
HIGH 8.3
open in calculator →
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