Vulnerability in Steeltoe.Configuration.Abstractions (CVE-2026-50267)
Summary
Vulnerability in Steeltoe.Configuration.Abstractions (CVE-2026-50267). Confidential information can be exposed externally. Exploitable via VCAP_SERVICES. Mitigation: upgrade to 4.2.0 or later.
Original description
The description as published by the source.
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Configuration.Abstractions 4.0.0 through 4.1.0, when MySQL or PostgreSQL service bindings from VCAP_SERVICES include TLS client credentials, the Connectors library writes those credentials to temporary files in Path.GetTempPath() using File.CreateText. On Linux, File.CreateText creates files with mode 0644 (world-readable) under the process umask, and the files are never deleted. The same key material is protected at mode 0400 in /proc//environ. Steeltoe.Configuration.Abstractions version 4.2.0 patches the issue. If an immediate upgrade is not possible, prevent other processes from running in the container under a different UID with access to /tmp.
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-2026-50267 has been found in Steeltoe.Configuration.Abstractions.
Attackers can target a specific entry point like VCAP_SERVICES over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 4.7/10.
What to do: upgrade Steeltoe.Configuration.Abstractions to 4.2.0 or later.
If unsure, ask your IT team or search "Steeltoe.Configuration.Abstractions CVE-2026-50267" on the vendor's site.
CVE-2026-50267 (Steeltoe.Configuration.Abstractions) — CWE-312 / CVSS v3 4.7
Attack vector: local / no user interaction
Attack surface: VCAP_SERVICES / File.CreateText / sslKey
Patched: 4.2.0 — 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.
A vulnerability (CWE-312) exists in Steeltoe.Configuration.Abstractions. Attackers reach the vulnerable code path via VCAP_SERVICES.
Check the vendor advisory for the affected versions of Steeltoe.Configuration.Abstractions. Attack surface: VCAP_SERVICES / File.CreateText / sslKey.
Severity: Medium (CVSS 4.7/10). Confidential information can be exposed externally.
Update to 4.2.0.
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 'Steeltoe.Configuration.Abstractions' . 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 'Steeltoe.Configuration.Abstractions' . | 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
Steeltoe.Configuration.Abstractions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 Steeltoe.Configuration.Abstractions to 4.2.0ステージング環境で 4.2.0 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。
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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