When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may...
Summary
Vulnerability reported (CVE-2026-77711). Confidential information can be exposed externally. Exploitable via HttpClient.
Original description
The description as published by the source.
When Jetty's HttpClient make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).
The client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the Proxy-Authentication header, which arrives to the server, that now has access to the proxy credentials.
Source: GitHub Security Advisories (Global) 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-2026-77711 has been found.
Attackers can target a specific entry point like HttpClient over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 7.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-77711" on the vendor's site.
CVE-2026-77711 — CWE-200 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: HttpClient
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.
Information disclosure (CWE-200) has been reported. Attackers reach the vulnerable code path via HttpClient without authentication.
Check the vendor advisory for the affected versions. Attack surface: HttpClient.
Severity: High (CVSS 7.5/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
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
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
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2Post-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。
References
- REDHAT Red Hat
- web github.com
- web nvd.nist.gov
- web emo@eclipse.org
- web github.com