CVE-2026-73812 PUBLISHED

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

Assigner: EEF
Reserved: 17.08.2026 Published: 01.09.2026 Updated: 01.09.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 8.3

Product Status

Vendor Erlang
Product OTP
Versions Default: unaffected
  • unknown from 0 to 17.0 (excl.)
  • affected from 17.0 to 27.3.4.17 (excl.)
  • affected from 28.0 to 28.5.0.6 (excl.)
  • affected from 29.0 to 29.0.6 (excl.)
Vendor Erlang
Product OTP
Versions Default: unaffected
  • unknown from 0 to 5.10 (excl.)
  • affected from 5.10 to 9.3.2.7 (excl.)
  • affected from 9.4 to 9.6.2.3 (excl.)
  • affected from 9.7 to 9.7.2 (excl.)
Vendor Erlang
Product OTP
Versions Default: unaffected
  • affected from 84adefa331c4159d432d22840663c38f155cd4c1 to 591dc00dc99dc2a426167a3b5257c0c94bd45e91 (excl.)

Credits

  • Konrad Pietrzak / Ericsson remediation developer
  • Lukas Backström / Erlang Solutions finder

References

Problem Types

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

Impacts

  • CAPEC-33 HTTP Request Smuggling