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Erlang OTP inets CVE-2026-73812

| EUVDEUVD-2026-69235 HIGH
HTTP Request/Response Smuggling (CWE-444)
2026-09-01 EEF
Information Disclosure Red Hat Request Smuggling Otp Suse Erlang
8.3
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

AC:H reflects the required CL-preferring proxy topology prerequisite; S:C because the attacker's request corrupts a different victim user's session on the same server.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Red Hat
8.2 HIGH
qualitative

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
POC Analysis Generated
Sep 10, 2026 - 11:28 vuln.today
Source Code Evidence Fetched
Sep 01, 2026 - 15:07 vuln.today
Analysis Generated
Sep 01, 2026 - 15:07 vuln.today
CVE Published
Sep 01, 2026 - 14:42 cve.org
HIGH 8.3

DescriptionCVE.org

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.

AnalysisAI

Request smuggling in Erlang OTP inets (versions 17.0 through 29.x) arises when the httpd server sits behind a Content-Length-preferring reverse proxy: inets frames the request body by chunked Transfer-Encoding and silently discards a co-present Content-Length header, while the front-end proxies request boundaries by Content-Length, producing a classic CL.TE desync. An unauthenticated network attacker in this topology can inject a crafted prefix into a subsequent victim's HTTP request, potentially enabling session hijacking, credential theft, or cache poisoning against other users of the same back-end. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires a two-tier HTTP/1.1 pipeline where the front-end component (load balancer, CDN, or reverse proxy) is configured to prefer Content-Length for request body framing while the inets httpd backend prefers Transfer-Encoding (chunked). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.3 is well-calibrated: AT:P (Attack Requirements: Present) correctly encodes that exploitation requires a specific proxy topology - a CL-preferring front-end forwarding to an inets backend - which is not the default or universal deployment mode, meaningfully limiting real-world exposure compared to the raw VI:H impact rating implies. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to OTP 27.3.4.17, OTP 28.5.0.6, or OTP 29.0.6 (bundling inets 9.3.2.7, 9.6.2.3, and 9.7.2 respectively), which add explicit HTTP 400 rejection for any request containing both Transfer-Encoding and Content-Length headers, eliminating the ambiguous parsing path entirely. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, audit your infrastructure to identify any Erlang OTP inets deployments and confirm whether they sit behind reverse proxies; document which OTP versions are running. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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CVE-2026-73812 vulnerability details – vuln.today
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