CVE-2026-73812

inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length

State: Published
Severity: 8.3 High
Published: Sep 1, 2026
Updated: Sep 8, 2026
Reserved: Aug 17, 2026

Description

httpd function check_header/3 rejects duplicate Content-Length (per CVE-2026-23941) but never checks for the TE+CL co-presence that RFC 9112 §6.3 identifies as a probable smuggling attempt. handle_body/3 frames by chunked and silently discards Content-Length. A CL-preferring front-end paired with chunked-preferring inets creates a classic CL.TE front-end/back-end desync.

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.

Scores

CVSS	Score	Vector	Source
4.0	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:N/SA:N	EEF

Weaknesses

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected Products

Product	Versions
OTPErlang	before 17.0Unknown 17.0 to before 27.3.4.17Affected 28.0 to before 28.5.0.6Affected 29.0 to before 29.0.6Affected
OTPErlang	before 5.10Unknown 5.10 to before 9.3.2.7Affected 9.4 to before 9.6.2.3Affected 9.7 to before 9.7.2Affected
OTPErlang	84adefa331c4159d432d22840663c38f155cd4c1 to before 591dc00dc99dc2a426167a3b5257c0c94bd45e91Affected

References

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