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CVE-2026-6790

Status: AnalyzedMedium (5.3)—

In Eclipse Jetty, for HTTP/1, HTTP/2 and HTTP/3 requests, there is no strict check that the request authority (host and port) matches what provided in the Host header (if present).

This was not enforced in earlier HTTP RFC (for example, in RFC 2616), but it is in the latest RFC (9110 and 9112).

This mismatch can cause a number of problems that may be classified as vulnerabilities such as:

Given that the latest RFCs require that request authority and Host header must match, Jetty should enforce this invariant.

Technical details traces, logs and code from the original report
  *

      URI constructions (for example, for redirects -- this is typical for login pages)

  *

      Virtual host selection

  *

      Reverse proxying

  *

      Misleading logs

  *

      Etc.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Eclipse — Jetty

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-6790",
  "cveTags": [],
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          "options": [
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      "lang": "en",
      "value": "In Eclipse Jetty, for HTTP/1, HTTP/2 and HTTP/3 requests, there is no strict check that the request authority (host and port) matches what provided in the Host header (if present).\n\n\n\n\nThis was not enforced in earlier HTTP RFC (for example, in RFC 2616), but it is in the latest RFC (9110 and 9112).\n\n\n\n\nThis mismatch can cause a number of problems that may be classified as vulnerabilities such as:\n\n\n\n  *  \n        \n      URI constructions (for example, for redirects -- this is typical for login pages)\n\n  *  \n        \n      Virtual host selection\n\n  *  \n        \n      Reverse proxying\n\n  *  \n        \n      Misleading logs\n\n  *  \n        \n      Etc.\n\n\n\n\n\n\nGiven that the latest RFCs require that request authority and Host header must match, Jetty should enforce this invariant."
    }
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  "lastModified": "2026-07-14T18:35:54.793",
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