CVE-2026-23941

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 58% 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
9.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.4Exploit: None knownExposed: 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 before OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to inets from 5.10 before 9.6.1, 9.3.2.3 and 9.1.0.5.

CVSS v3
9.4
EG Score
9.4(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity94% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

March 13, 2026

Last Modified

July 24, 2026

Advisory Details (7)

Auto-updated Sep 14, 2026
Patch available. Sources: github_commit, github.
generic

Versions — Erlang System Documentation v29.0.6

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
github_commit

commit e775a332f623 (erlang/otp)

Fix landed in erlang/otp commit e775a332f623 — awaiting tagged release

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

commit a761d391d8d0 (erlang/otp)

Fix landed in erlang/otp commit a761d391d8d0 — awaiting tagged release

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

commit a4b46336fd25 (erlang/otp)

Fix landed in erlang/otp commit a4b46336fd25 — awaiting tagged release

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

CVE-2026-23941

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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
erlang1:23.2.6+dfsg-1, 1:23.2.6+dfsg-1+deb11u1, 1:23.2.6+dfsg-1+deb11u2, 1:23.2.6+dfsg-1+deb11u31:23.2.6+dfsg-1+deb11u4—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
erlang1:25.2.3+dfsg-1, 1:25.2.3+dfsg-1+deb12u1, 1:25.2.3+dfsg-1+deb12u2, 1:25.2.3+dfsg-1+deb12u31:25.2.3+dfsg-1+deb12u4—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
erlang1:27.3.4.1+dfsg-1, 1:27.3.4.1+dfsg-1+deb13u11:27.3.4.1+dfsg-1+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
erlang1:27.3.4.1+dfsg-1, 1:27.3.4.3+dfsg-1, 1:27.3.4.4+dfsg-1, 1:27.3.4.6+dfsg-1, 1:27.3.4.8+dfsg-11:27.3.4.9+dfsg-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 25× 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 228 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-16 14:07 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-12 15:01 UTCEPSS rescore
  6. 2026-09-11 14:52 UTCEPSS rescore
  7. 2026-09-10 09:34 UTCEPSS rescore
  8. 2026-09-08 22:00 UTCEPSS rescore
  9. 2026-09-07 16:01 UTCEPSS rescore
  10. 2026-09-06 13:47 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-02 19:10 UTCOSV refresh
  14. 2026-09-02 14:11 UTCEPSS rescore
  15. 2026-09-01 13:53 UTCEPSS rescore
  16. 2026-09-01 04:39 UTCEPSS rescore
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-28 21:41 UTCEPSS rescore
  20. 2026-08-27 14:25 UTCEPSS rescore
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-25 13:48 UTCEPSS rescore
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-20 22:55 UTCEPSS rescore
Show 75 more
  1. 2026-08-19 17:03 UTCEPSS rescore
  2. 2026-08-18 13:48 UTCEPSS rescore
  3. 2026-08-17 13:47 UTCEPSS rescore
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-16 11:39 UTCEG score recompute
  6. 2026-08-16 11:39 UTCVendor advisory
  7. 2026-08-16 02:14 UTCEPSS rescore
  8. 2026-08-15 01:30 UTCEPSS rescore
  9. 2026-08-15 00:21 UTCVendor advisory
  10. 2026-08-14 20:10 UTCVendor advisory
  11. 2026-08-14 16:00 UTCVendor advisory
  12. 2026-08-14 11:50 UTCVendor advisory
  13. 2026-08-14 07:41 UTCEG score recompute
  14. 2026-08-14 07:41 UTCVendor advisory
  15. 2026-08-13 22:00 UTCEPSS rescore
  16. 2026-08-12 22:40 UTCEG score recompute
  17. 2026-08-12 13:50 UTCEPSS rescore
  18. 2026-08-12 01:51 UTCVendor advisory
  19. 2026-08-11 21:41 UTCEG score recompute
  20. 2026-08-11 21:41 UTCVendor advisory
  21. 2026-08-11 13:42 UTCEPSS rescore
  22. 2026-08-11 08:59 UTCVendor advisory
  23. 2026-08-11 04:49 UTCEG score recompute
  24. 2026-08-11 04:49 UTCVendor advisory
  25. 2026-08-11 00:00 UTCEPSS rescore
  26. 2026-08-10 12:53 UTCVendor advisory
  27. 2026-08-10 06:37 UTCVendor advisory
  28. 2026-08-10 02:05 UTCVendor advisory
  29. 2026-08-09 17:36 UTCEG score recompute
  30. 2026-08-09 17:36 UTCVendor advisory
  31. 2026-08-09 13:46 UTCEPSS rescore
  32. 2026-08-09 13:26 UTCVendor advisory
  33. 2026-08-09 07:21 UTCEG score recompute
  34. 2026-08-09 07:21 UTCVendor advisory
  35. 2026-08-08 16:37 UTCEPSS rescore
  36. 2026-08-08 11:27 UTCVendor advisory
  37. 2026-08-08 06:32 UTCVendor advisory
  38. 2026-08-07 22:11 UTCVendor advisory
  39. 2026-08-07 18:01 UTCEG score recompute
  40. 2026-08-06 19:47 UTCEG score recompute
  41. 2026-08-06 19:47 UTCVendor advisory
  42. 2026-08-06 13:46 UTCEPSS rescore
  43. 2026-08-06 10:30 UTCVendor advisory
  44. 2026-08-06 06:04 UTCVendor advisory
  45. 2026-08-06 01:54 UTCEG score recompute
  46. 2026-08-06 01:54 UTCVendor advisory
  47. 2026-08-05 19:17 UTCEPSS rescore
  48. 2026-08-04 15:10 UTCEPSS rescore
  49. 2026-08-04 10:38 UTCEPSS rescore
  50. 2026-08-04 01:10 UTCEG score recompute
  51. 2026-08-04 01:10 UTCVendor advisory
  52. 2026-08-03 10:35 UTCEPSS rescore
  53. 2026-08-03 01:38 UTCVendor advisory
  54. 2026-08-02 21:28 UTCVendor advisory
  55. 2026-08-02 17:18 UTCEG score recompute
  56. 2026-08-02 17:18 UTCVendor advisory
  57. 2026-08-02 02:26 UTCEPSS rescore
  58. 2026-08-01 04:15 UTCEPSS rescore
  59. 2026-07-30 01:30 UTCEPSS rescore
  60. 2026-07-27 14:13 UTCEPSS rescore
  61. 2026-07-26 14:54 UTCEPSS rescore
  62. 2026-07-26 14:54 UTCEPSS rescore
  63. 2026-07-26 09:38 UTCEG score recompute
  64. 2026-07-26 09:38 UTCVendor advisory
  65. 2026-07-25 14:17 UTCEPSS rescore
  66. 2026-07-25 14:17 UTCEPSS rescore
  67. 2026-07-24 14:17 UTCEPSS rescore
  68. 2026-07-23 14:18 UTCEPSS rescore
  69. 2026-07-23 14:18 UTCEPSS rescore
  70. 2026-07-23 03:07 UTCEG score recompute
  71. 2026-07-22 14:08 UTCEPSS rescore
  72. 2026-07-21 15:24 UTCEPSS rescore
  73. 2026-07-21 15:24 UTCEPSS rescore
  74. 2026-07-20 17:08 UTCEPSS rescore
  75. 2026-07-19 14:31 UTCEPSS rescore

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 July 24, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 61.3% of all scored CVEs.
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.

Dependency Blast Radius

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