CVE-2026-38969

✕ Withdrawn — historical dataHIGHPre-NVD 7.5Elevated
7.5CVSS
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

A fix is available — apply it.

ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling. NOTE: the Supplier reports that "The project README states that it is suitable for testing and development, and that its developers do not encourage its use to serve production web applications that may be subject to hostile input. It is not a production web server and is not intended to receive traffic from untrusted sources. Request smuggling is only reachable when WEBrick sits behind a proxy and receives hostile traffic in a production deployment, which is the configuration the project documents as discouraged."

CVSS v3
7.5
EchelonGraph score
Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.
EG Score
—
EG Risk
—
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

July 2, 2026

Last Modified

July 10, 2026

Advisory Details (2)

Auto-updated Jul 6, 2026
No patch confirmed yet. Sources: github_pr.
generic

[BUG] WEBrick reparses trailer Content-Length into canonical request state, enabling request metadata confusion / request smuggling · Issue #198 · ruby/webrick · GitHub

https://github.com/ruby/webrick/issues/198
github_pr

Only allow specific trailers

Upstream fix in progress (PR #199 · ruby/webrick, state=open)

https://github.com/ruby/webrick/pull/199

Vendor Advisories for CVE-2026-38969(3)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrust-main-1.96.1-1.hum12026-07-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 15× 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.

  1. 2026-08-18 20:54 UTCVendor advisory
  2. 2026-08-18 20:54 UTCGHSA enrichment
  3. 2026-08-15 07:56 UTCVendor advisory
  4. 2026-08-15 07:56 UTCGHSA enrichment
  5. 2026-08-12 00:24 UTCVendor advisory
  6. 2026-08-12 00:24 UTCGHSA enrichment
  7. 2026-08-08 17:59 UTCVendor advisory
  8. 2026-08-08 17:59 UTCGHSA enrichment
  9. 2026-08-05 11:39 UTCGHSA enrichment
  10. 2026-08-02 04:04 UTCEG score recompute
  11. 2026-08-02 04:04 UTCGHSA enrichment
  12. 2026-07-29 21:42 UTCGHSA enrichment
  13. 2026-07-26 13:00 UTCEG score recompute
  14. 2026-07-26 13:00 UTCGHSA enrichment
  15. 2026-07-23 03:10 UTCEG score recompute▼ 7.50
  16. 2026-07-16 20:49 UTCGHSA enrichment
  17. 2026-07-16 08:07 UTCGHSA enrichment
  18. 2026-07-15 19:24 UTCGHSA enrichment
  19. 2026-07-15 06:42 UTCGHSA enrichment
  20. 2026-07-15 02:00 UTCEPSS rescore
  21. 2026-07-14 17:59 UTCVendor advisory
  22. 2026-07-14 17:59 UTCGHSA enrichment
  23. 2026-07-14 05:18 UTCVendor advisory
  24. 2026-07-14 05:18 UTCGHSA enrichment
  25. 2026-07-13 22:30 UTCEPSS rescore
Show 37 more
  1. 2026-07-13 16:35 UTCVendor advisory
  2. 2026-07-13 16:35 UTCGHSA enrichment
  3. 2026-07-13 06:13 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-13 03:51 UTCVendor advisory
  6. 2026-07-13 03:51 UTCGHSA enrichment
  7. 2026-07-12 15:09 UTCVendor advisory
  8. 2026-07-12 15:08 UTCGHSA enrichment
  9. 2026-07-12 05:46 UTCEPSS rescore
  10. 2026-07-12 02:24 UTCVendor advisory
  11. 2026-07-12 02:24 UTCGHSA enrichment
  12. 2026-07-11 13:42 UTCVendor advisory
  13. 2026-07-11 13:42 UTCGHSA enrichment
  14. 2026-07-11 08:27 UTCEPSS rescore
  15. 2026-07-11 01:00 UTCVendor advisory
  16. 2026-07-11 00:59 UTCGHSA enrichment
  17. 2026-07-10 12:17 UTCVendor advisory
  18. 2026-07-10 12:17 UTCGHSA enrichment
  19. 2026-07-09 23:33 UTCVendor advisory
  20. 2026-07-09 23:33 UTCGHSA enrichment
  21. 2026-07-09 19:10 UTCEPSS rescore
  22. 2026-07-09 10:50 UTCEG score recompute▲ 7.50
  23. 2026-07-09 10:50 UTCVendor advisory
  24. 2026-07-09 10:50 UTCGHSA enrichment
  25. 2026-07-08 15:15 UTCEPSS rescore
  26. 2026-07-07 13:46 UTCEPSS rescore
  27. 2026-07-06 16:27 UTCEPSS rescore
  28. 2026-07-06 16:27 UTCEPSS rescore
  29. 2026-07-06 15:36 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  30. 2026-07-06 04:27 UTCVendor advisory
  31. 2026-07-06 04:27 UTCGHSA enrichment
  32. 2026-07-06 02:23 UTCEPSS rescore
  33. 2026-07-06 02:23 UTCEPSS rescore
  34. 2026-07-05 02:30 UTCEPSS rescore
  35. 2026-07-04 06:31 UTCEPSS rescore
  36. 2026-07-02 22:06 UTCEG score recompute
  37. 2026-07-02 22:06 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-38969?
CVE-2026-38969 is a high vulnerability published on July 2, 2026. ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling. NOTE: the Supplier reports that "The project README states that it is suitable for testing and development, and that its developers do not encourage its use to serve…
When was CVE-2026-38969 disclosed?
CVE-2026-38969 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-38969 actively exploited?
CVE-2026-38969 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 72.6% of all scored CVEs.
What is the CVSS score of CVE-2026-38969?
CVE-2026-38969 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-38969?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-38969, 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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