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CVE-2026-49834 medium CVSS 5.9

Vulnerability in github.com/sigstore/sigstore-go (CVE-2026-49834)

Summary

vulnerability in github.com/sigstore/sigstore-go (CVE-2026-49834). Data can be tampered with by attackers. Mitigation: upgrade to `1.2.0` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-49834** has been found in github.com/sigstore/sigstore-go. Data can be tampered with by attackers. CVSS score: 5.9/10. What to do: upgrade github.com/sigstore/sigstore-go to **1.2.0** or later. If unsure, ask your IT team or search "github.com/sigstore/sigstore-go CVE-2026-49834" on the vendor's site.
CVE-2026-49834 (github.com/sigstore/sigstore-go) — CWE-345 / CVSS v3 5.9 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Patched: `1.2.0` — 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.
❓ What is the problem
**A vulnerability** (CWE-345) exists in github.com/sigstore/sigstore-go.
📍 Affected scope
github.com/sigstore/sigstore-go — .
🔥 Severity
Severity: Medium (CVSS 5.9/10). Data can be tampered with by attackers
🔧 How to fix
Update to **1.2.0**.
🛡️ 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. Run `grep -r 'github.com/sigstore/sigstore-go' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response Actions (7 steps)

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

  1. 1
    Identify exposure identify 
    grep -r 'github.com/sigstore/sigstore-go' . | 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 `github.com/sigstore/sigstore-go` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade github.com/sigstore/sigstore-go to 1.2.0

    ステージング環境で 1.2.0 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と、Step 3 で見つけた異常検知の続報チェックを含めること。

  3. 7
    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 Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

go github.com/sigstore/sigstore-go
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.2.0"}]}]

References

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