CVE-2026-73812
inets, httpd: HTTP Request Smuggling via Transfer-Encoding and Content-Length
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, OTP 28.5.0.6, and OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, 9.6.2.3, and 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: EEFAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| OTP Erlang otp
software-id |
≥ 17.0; < * (affected, otp); unaffected at 27.3.4.17; unaffected at 28.5.0.6; unaffected at 29.0.6
Other versions: unknown |
CNA: EEF |
| OTP Erlang inets
otp |
≥ 5.10; < * (affected, otp); unaffected at 9.3.2.7; unaffected at 9.6.2.3; unaffected at 9.7.2
Other versions: unknown |
CNA: EEF |
| OTP Erlang erlang/otp
github |
≥ 84adefa331c4159d432d22840663c38f155cd4c1; < 591dc00dc99dc2a426167a3b5257c0c94bd45e91 (affected, git) ≥ 591dc00dc99dc2a426167a3b5257c0c94bd45e91; < * (unaffected, git) Other versions: unknown |
CNA: EEF |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 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 | CNA: EEF |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/erlang/otp/security/advisories/GHSA-7j6m-4ffg-hg46CNA: EEF · vendor-advisory
- https://cna.erlef.org/cves/CVE-2026-73812.htmlCNA: EEF · related
- https://osv.dev/vulnerability/EEF-CVE-2026-73812CNA: EEF · related
- https://www.erlang.org/doc/system/versions.html#order-of-versionsCNA: EEF · x_version-scheme
- https://github.com/erlang/otp/commit/591dc00dc99dc2a426167a3b5257c0c94bd45e91CNA: EEF · patch
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