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CVE-2026-6790 medium CVSS 5.3

Vulnerability in org.eclipse.jetty:jetty-server (CVE-2026-6790)

Summary

Vulnerability in org.eclipse.jetty:jetty-server (CVE-2026-6790). Risk of unauthorized operations or information disclosure. Exploitable via Host header. Mitigation: upgrade to 12.1.9 or later.

Original description

The description as published by the source.

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:

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

  Virtual host selection

  Reverse proxying

  Misleading logs

  Etc.

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

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-6790 has been found in org.eclipse.jetty:jetty-server.
Attackers can target a specific entry point like Host header over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade org.eclipse.jetty:jetty-server to 12.1.9 or later.
If unsure, ask your IT team or search "org.eclipse.jetty:jetty-server CVE-2026-6790" on the vendor's site.

CVE-2026-6790 (org.eclipse.jetty:jetty-server) — CWE-20 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Host header / HttpURI / Host / MISMATCHED_AUTHORITY
Patched: 12.1.9 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-20) exists in org.eclipse.jetty:jetty-server. Attackers reach the vulnerable code path via Host header without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of org.eclipse.jetty:jetty-server. Attack surface: Host header / HttpURI / Host / MISMATCHED_AUTHORITY.

🔥 Severity

Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 12.1.9.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.eclipse.jetty:jetty-server を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade org.eclipse.jetty:jetty-server to 12.1.9

    ステージング環境で 12.1.9 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

maven org.eclipse.jetty:jetty-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"12.1.9"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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