CVE-2026-93567

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-18. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation2% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.5%
EPSS %ILE
73rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 18, 2026

Last Modified

September 22, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
Patch available. Sources: redhat.
redhat

2536955 – (CVE-2026-93567) CVE-2026-93567 io.netty/netty-codec-http2: HTTP/1 authority-form CONNECT is translated to malformed HTTP/2 CONNECT with Host-controlled :authority

https://bugzilla.redhat.com/show_bug.cgi?id=2536955
redhat Patch Available

CVE-2026-93567 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-93567

Vendor Advisories for CVE-2026-93567(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (7 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 79× 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. 2026-10-05 02:43 UTCGHSA enrichment
  2. 2026-10-04 13:57 UTCGHSA enrichment
  3. 2026-10-04 01:11 UTCEG score recompute
  4. 2026-10-04 01:11 UTCGHSA enrichment
  5. 2026-10-03 14:26 UTCEPSS rescore
  6. 2026-10-03 12:25 UTCGHSA enrichment
  7. 2026-10-02 23:38 UTCEG score recompute
  8. 2026-10-02 23:38 UTCGHSA enrichment
  9. 2026-10-02 10:49 UTCGHSA enrichment
  10. 2026-10-01 21:53 UTCEG score recompute
  11. 2026-10-01 21:53 UTCGHSA enrichment
  12. 2026-10-01 19:51 UTCEPSS rescore
  13. 2026-10-01 09:02 UTCGHSA enrichment
  14. 2026-09-30 20:17 UTCEG score recompute
  15. 2026-09-30 20:17 UTCGHSA enrichment
  16. 2026-09-30 15:04 UTCEPSS rescore
  17. 2026-09-30 07:31 UTCGHSA enrichment
  18. 2026-09-29 18:45 UTCEG score recompute
  19. 2026-09-29 18:44 UTCGHSA enrichment
  20. 2026-09-29 05:57 UTCEG score recompute
  21. 2026-09-29 05:57 UTCGHSA enrichment
  22. 2026-09-28 17:10 UTCEG score recompute
  23. 2026-09-28 17:10 UTCGHSA enrichment
  24. 2026-09-28 13:52 UTCEPSS rescore
  25. 2026-09-28 13:52 UTCEPSS rescore
Show 54 more
  1. 2026-09-28 04:22 UTCGHSA enrichment
  2. 2026-09-27 15:36 UTCEG score recompute
  3. 2026-09-27 15:36 UTCGHSA enrichment
  4. 2026-09-27 13:49 UTCEPSS rescore
  5. 2026-09-27 02:50 UTCEG score recompute
  6. 2026-09-27 02:50 UTCGHSA enrichment
  7. 2026-09-26 15:59 UTCEPSS rescore
  8. 2026-09-26 14:03 UTCGHSA enrichment
  9. 2026-09-26 00:46 UTCEG score recompute
  10. 2026-09-26 00:46 UTCGHSA enrichment
  11. 2026-09-25 11:46 UTCGHSA enrichment
  12. 2026-09-24 22:59 UTCEG score recompute
  13. 2026-09-24 22:59 UTCGHSA enrichment
  14. 2026-09-24 14:04 UTCEPSS rescore
  15. 2026-09-24 09:54 UTCGHSA enrichment
  16. 2026-09-23 21:08 UTCEG score recompute
  17. 2026-09-23 21:08 UTCGHSA enrichment
  18. 2026-09-23 17:54 UTCEPSS rescore
  19. 2026-09-23 08:22 UTCGHSA enrichment
  20. 2026-09-22 19:36 UTCEG score recompute
  21. 2026-09-22 19:36 UTCGHSA enrichment
  22. 2026-09-22 18:59 UTCEG score recompute
  23. 2026-09-22 18:59 UTCGHSA enrichment
  24. 2026-09-22 16:01 UTCEPSS rescore
  25. 2026-09-22 10:11 UTCGHSA enrichment
  26. 2026-09-21 21:25 UTCEG score recompute
  27. 2026-09-21 21:25 UTCGHSA enrichment
  28. 2026-09-21 21:09 UTCEPSS rescore
  29. 2026-09-21 20:59 UTCEG score recompute
  30. 2026-09-21 20:59 UTCGHSA enrichment
  31. 2026-09-21 17:26 UTCEG score recompute
  32. 2026-09-21 17:26 UTCGHSA enrichment
  33. 2026-09-21 16:50 UTCEG score recompute
  34. 2026-09-21 16:50 UTCGHSA enrichment
  35. 2026-09-21 13:22 UTCGHSA enrichment
  36. 2026-09-21 00:36 UTCEG score recompute
  37. 2026-09-21 00:36 UTCGHSA enrichment
  38. 2026-09-20 20:16 UTCEPSS rescore
  39. 2026-09-20 11:49 UTCGHSA enrichment
  40. 2026-09-19 22:59 UTCEG score recompute
  41. 2026-09-19 22:59 UTCGHSA enrichment
  42. 2026-09-19 10:13 UTCGHSA enrichment
  43. 2026-09-18 21:28 UTCEG score recompute
  44. 2026-09-18 21:28 UTCGHSA enrichment
  45. 2026-09-18 20:29 UTCEG score recompute
  46. 2026-09-18 20:29 UTCGHSA enrichment
  47. 2026-09-18 19:27 UTCGHSA enrichment
  48. 2026-09-18 19:08 UTCEG score recompute
  49. 2026-09-18 19:08 UTCGHSA enrichment
  50. 2026-09-18 18:59 UTCEG score recompute
  51. 2026-09-18 18:59 UTCGHSA enrichment
  52. 2026-09-18 15:24 UTCEG score recompute
  53. 2026-09-18 14:34 UTCEG score recompute
  54. 2026-09-18 14:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-93567?
CVE-2026-93567 is a high vulnerability published on September 18, 2026. A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading…
When was CVE-2026-93567 disclosed?
CVE-2026-93567 was first published on September 18, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93567 actively exploited?
CVE-2026-93567 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.5% probability of exploitation in the next 30 days (73rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-93567?
CVE-2026-93567 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-93567?
A fix for CVE-2026-93567 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-93567 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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