CVE-2026-23941

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in Erlang OTP (inets httpd module) allows HTTP Request Smuggling.

This vulnerability is associated with program files lib/inets/src/http_server/httpd_request.erl and program routines httpd_request:parse_headers/7.

The server does not reject or normalize duplicate Content-Length headers. The earliest Content-Length in the request is used for body parsing while common reverse proxies (nginx, Apache httpd, Envoy) honor the last Content-Length value. This violates RFC 9112 Section 6.3 and allows front-end/back-end desynchronization, leaving attacker-controlled bytes queued as the start of the next request.

This issue affects OTP from OTP 17.0 until OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to inets from 5.10 until 9.6.1, 9.3.2.3 and 9.1.0.5.

CVSS v3
9.4
EG Score
9.4(medium)
EPSS
41.1%
KEV
Not listed

Published

March 13, 2026

Last Modified

May 21, 2026

Advisory Details (7)

Auto-updated May 21, 2026
Patch available. Sources: github.
generic

Versions — Erlang System Documentation v29.0

https://www.erlang.org/doc/system/versions.html#order-of-versions
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-23941
github Patch Available

Request smuggling via first-wins Content-Length parsing in inets httpd · Advisory · erlang/otp · GitHub

https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7
generic

Merge branch 'whaileee/inets/httpd/http-request-smuggling/OTP-20007' … · erlang/otp@e775a33 · GitHub

https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6
generic

Merge branch 'whaileee/inets/httpd/http-request-smuggling/OTP-20007' … · erlang/otp@a761d39 · GitHub

https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b
generic

Merge branch 'whaileee/inets/httpd/http-request-smuggling/OTP-20007' … · erlang/otp@a4b4633 · GitHub

https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18
generic

Request smuggling via first-wins Content-Length parsing in inets httpd | Erlang Ecosystem Foundation CNA

https://cna.erlef.org/cves/CVE-2026-23941.html

Vendor Advisories for CVE-2026-23941(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 132 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-29 14:06 UTCEPSS rescore
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  33. 2026-06-12 00:13 UTCVendor advisory
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  38. 2026-06-10 20:11 UTCVendor advisory
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  40. 2026-06-10 16:01 UTCVendor advisory
  41. 2026-06-10 13:22 UTCEPSS rescore
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  43. 2026-06-10 10:59 UTCVendor advisory
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  45. 2026-06-10 06:04 UTCVendor advisory
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  47. 2026-06-10 01:53 UTCVendor advisory
  48. 2026-06-09 16:53 UTCEG score recompute
  49. 2026-06-09 16:53 UTCVendor advisory
  50. 2026-06-08 14:17 UTCEPSS rescore
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  53. 2026-06-08 07:45 UTCVendor advisory
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  63. 2026-06-07 14:51 UTCEG score recompute▲ 9.40
  64. 2026-06-07 14:51 UTCVendor advisory
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Frequently asked(5)

What is CVE-2026-23941?
CVE-2026-23941 is a critical vulnerability published on March 13, 2026. Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in Erlang OTP (inets httpd module) allows HTTP Request Smuggling. This vulnerability is associated with program files lib/inets/src/httpserver/httpdrequest.erl and program routines httpdrequest:parseheaders/7. The…
When was CVE-2026-23941 disclosed?
CVE-2026-23941 was first published in the National Vulnerability Database on March 13, 2026, with the most recent update on May 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23941 actively exploited?
CVE-2026-23941 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 41.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-23941?
CVE-2026-23941 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-23941?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23941, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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