8.3

CVE-2026-73812: erlang otp HTTP Request/Response Smuggling

CVSS: 8.3v4.0HighDeferred
AliasesUBUNTU-CVE-2026-73812DEBIAN-CVE-2026-73812
Published 01-09-2026Last modified 08-09-2026
Open JSON

Vulnerability summary

CVE-2026-73812 is a high (CVSS 8.3) HTTP Request/Response Smuggling vulnerability in erlang otp. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43.1% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v4.0 (CVE.org)
EPSS score
0.52%
0%100%
Low · +0.22 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
RHSA-2026:62531USN-8827-1

Timeline

  1. 01-09-2026
    PublishedVulnerability first disclosed.
  2. 08-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

+0.22 pp

From 0.30% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • erlangAll versions (No fix recorded) | < 1:29.0.6+dfsg-1
Erlang1 product
  • otp≥ 17.0, < 27.3.4.17 | ≥ 28.0, < 28.5.0.6 | ≥ 29.0, < 29.0.6 | ≥ 5.10, < 9.3.2.7 | ≥ 9.4, < 9.6.2.3 | ≥ 9.7, < 9.7.2 | ≥ 84adefa331c4159d432d22840663c38f155cd4c1, < 591dc00dc99dc2a426167a3b5257c0c94bd45e91
Ubuntu1 product
  • erlang< 1:16.b.3-dfsg-1ubuntu2.2+esm2 | < 1:18.3-dfsg-1ubuntu3.1+esm3 | < 1:20.2.2+dfsg-1ubuntu2+esm3 | < 1:22.2.7+dfsg-1ubuntu0.5+esm2 | < 1:24.2.1+dfsg-1ubuntu0.7 | < 1:25.3.2.8+dfsg-1ubuntu4.7 | < 1:27.3.4.6+dfsg-1ubuntu0.1

3 vendors · 3 products

References

9 links