Information Disclosure in builder-util-runtime (CVE-2026-54673)
Summary
Vulnerability in builder-util-runtime (CVE-2026-54673). Confidential information can be exposed externally. Exploitable via HttpExecutor.prepareRedirectUrlOptions. Mitigation: upgrade to 9.7.0 or later.
Original description
The description as published by the source.
electron-updater allows for automatic updates for Electron apps. Prior to 9.7.0, the HTTP redirect handler (HttpExecutor.prepareRedirectUrlOptions) only stripped a credential header whose key string matched exactly lowercase "authorization", exposing credentials. Other credential-bearing headers — most notably PRIVATE-TOKEN (used by GitLab's personal access token flow) and mixed-case Authorization (used by GitLab's Bearer/OAuth flow) — were not stripped and could be forwarded to an attacker-controlled cross-origin redirect destination. This issue has been fixed in version 9.7.0.
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-2026-54673 has been found in builder-util-runtime.
Attackers can target a specific entry point like HttpExecutor.prepareRedirectUrlOptions over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade builder-util-runtime to 9.7.0 or later.
If unsure, ask your IT team or search "builder-util-runtime CVE-2026-54673" on the vendor's site.
CVE-2026-54673 (builder-util-runtime) — CWE-200 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: HttpExecutor.prepareRedirectUrlOptions / Authorization / undefined / direct_asset_url
Patched: 9.7.0 — 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.
Information disclosure (CWE-200) exists in builder-util-runtime. Attackers reach the vulnerable code path via HttpExecutor.prepareRedirectUrlOptions.
Check the vendor advisory for the affected versions of builder-util-runtime. Attack surface: HttpExecutor.prepareRedirectUrlOptions / Authorization / undefined / direct_asset_url.
Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.
Update to 9.7.0.
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. Run grep -r 'builder-util-runtime' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'builder-util-runtime' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
builder-util-runtimeを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade builder-util-runtime to 9.7.0ステージング環境で 9.7.0 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。
-
3Post-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
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- web github.com
- web github.com
- web github.com