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CVE-2026-6790 Eclipse Foundation CVE debrief

CVE-2026-6790 is a medium-severity vulnerability in Eclipse Jetty, a popular Java-based web server and servlet engine. The issue arises from the lack of strict checks ensuring that the request authority (host and port) matches the Host header for HTTP/1, HTTP/2, and HTTP/3 requests. This mismatch can lead to various problems, including URI construction issues, virtual host selection problems, reverse proxying concerns, and misleading logs. The vulnerability is rated with a CVSS score of 5.3 and a severity of MEDIUM.

Vendor
Eclipse Foundation
Product
Eclipse Jetty
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-14
Advisory published
2026-07-14
Advisory updated
2026-07-14

Who should care

Users of Eclipse Jetty, especially those who rely on it for hosting web applications or services, should be aware of this vulnerability. This includes developers, system administrators, and security professionals responsible for maintaining and securing web servers.

Technical summary

The vulnerability exists because Eclipse Jetty does not enforce a strict check that the request authority (host and port) matches what is provided in the Host header (if present). This was not enforced in earlier HTTP RFCs (e.g., RFC 2616) but is required in the latest RFCs (9110 and 9112). The mismatch can cause several issues, including problems with URI constructions (e.g., for redirects), virtual host selection, reverse proxying, and misleading logs. To address this, Jetty should enforce the invariant that the request authority and Host header must match, as required by the latest RFCs.

Defensive priority

Given the medium severity and potential impact, prioritizing defensive measures for this vulnerability is recommended. Organizations using Eclipse Jetty should review their configurations and ensure that appropriate mitigations are in place until an official patch is available.

Recommended defensive actions

  • Review and update Eclipse Jetty configurations to ensure secure request authority and Host header handling.
  • Implement compensating controls, such as additional logging and monitoring, to detect potential issues related to this vulnerability.
  • Consider applying patches or updates as soon as they are available from the vendor.
  • Conduct regular inventory checks to identify and address any instances of Eclipse Jetty in your environment.
  • Enhance monitoring and exception tracking to identify potential exploitation attempts or related anomalies.

Evidence notes

The CVE record was published on 2026-07-14T09:16:41.930Z and has not been modified since then. The NVD entry is currently in the 'Received' status. Limited information is available about the specific details of the vulnerability and its potential impact. Further investigation and review of official documentation and vendor advisories are recommended.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T09:16:41.930Z and has not been modified since then. The NVD entry is currently Received.