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Fencer Intel
high 8.3

CVE-2026-73812 json

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

published 2mo ago modified 14h ago also EUVD-2026-69235 , GHSA-7j6m-4ffg-hg46

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository erlang/otp. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
8.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Patch / fix

  • Erlang OTP 9.3.2.7, 9.6.2.3, 9.7.2, 27.3.4.17, 28.5.0.6, 29.0.6
  • erlang Debian 13 1:27.3.4.1+dfsg-1+deb13u4
  • erlang Debian 14 1:29.0.6+dfsg-1

debian advisories DEBIAN-CVE-2026-73812

  • erlang Ubuntu 22.04 LTS 1:24.2.1+dfsg-1ubuntu0.7
  • erlang Ubuntu 24.04 LTS 1:25.3.2.8+dfsg-1ubuntu4.7
  • erlang Ubuntu 26.04 LTS 1:27.3.4.6+dfsg-1ubuntu0.1
  • erlang Ubuntu Pro 14.04 LTS 1:16.b.3-dfsg-1ubuntu2.2+esm2
  • erlang Ubuntu Pro 16.04 LTS 1:18.3-dfsg-1ubuntu3.1+esm3
  • erlang Ubuntu Pro 18.04 LTS 1:20.2.2+dfsg-1ubuntu2+esm3
  • erlang Ubuntu Pro 20.04 LTS 1:22.2.7+dfsg-1ubuntu0.5+esm2

ubuntu advisories UBUNTU-CVE-2026-73812

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • erlang27 hummingbird 1 27.3.4.17-0.1.hum1
  • erlang27-et hummingbird 1 27.3.4.17-0.1.hum1
  • erlang27-wx hummingbird 1 27.3.4.17-0.1.hum1
  • erlang27-ftp hummingbird 1 27.3.4.17-0.1.hum1
  • erlang27-ssh hummingbird 1 27.3.4.17-0.1.hum1
  • erlang27-ssl hummingbird 1 27.3.4.17-0.1.hum1
  • erlang27-asn1 hummingbird 1 27.3.4.17-0.1.hum1
  • erlang27-edoc hummingbird 1 27.3.4.17-0.1.hum1

red hat advisories RHSA-2026:62531

  • erlang Azure Linux 3.0 26.2.5.21-6

azure linux advisories AZL-98490

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-73812 updated cvss 8.2

OTP: inets: inets: HTTP Request Smuggling allows bypassing security controls

  • Red Hat Hardened Images erlang27 27.3.4.17-0.1.hum1, erlang27-et 27.3.4.17-0.1.hum1, erlang27-wx 27.3.4.17-0.1.hum1, erlang27-ftp 27.3.4.17-0.1.hum1, erlang27-ssh 27.3.4.17-0.1.hum1, erlang27-ssl 27.3.4.17-0.1.hum1, +33 more
    fixed: vendor fix “No mitigation is currently available for this vulnerability. Red Hat recommends applying the appropriate security update as soon as it becomes available.” RHSA-2026:62531
  • Red Hat Cryostat 4 cryostat/cryostat-storage-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/volsync-rhel9
    not affected: component not present
  • Red Hat OpenShift Dev Spaces devspaces/traefik-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 8.3 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 4.0 8.3 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

Affected products

  • Erlang OTP

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of erlang/otp published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.