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CVE-2026-8657 high CVSS 8.2

Vulnerability in jsondiffpatch (CVE-2026-8657)

Summary

Vulnerability in jsondiffpatch (CVE-2026-8657). Data can be tampered with by attackers. Mitigation: upgrade to 0.7.6 or later.

Original description

The description as published by the source.

Versions of the package jsondiffpatch before 0.7.6 are vulnerable to Prototype Pollution via the jsondiffpatch.patch() and jsondiffpatch/formatters/jsonpatch.patch() APIs. An attacker can perform prototype pollution by supplying crafted delta or JSON Patch documents, as attacker-controlled property names and path segments are used to traverse and modify objects without restricting access to special properties like proto or constructor.prototype, allowing modification of Object.prototype.

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-2026-8657 has been found in jsondiffpatch.
Data can be tampered with by attackers. CVSS score: 8.2/10.
What to do: upgrade jsondiffpatch to 0.7.6 or later.
If unsure, ask your IT team or search "jsondiffpatch CVE-2026-8657" on the vendor's site.

CVE-2026-8657 (jsondiffpatch) — CWE-1321 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 0.7.6 — 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-1321) exists in jsondiffpatch.

📍 Affected scope

Check the vendor advisory for the affected versions of jsondiffpatch.

🔥 Severity

Severity: High (CVSS 8.2/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 0.7.6.

🛡️ 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 'jsondiffpatch' . 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

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

  2. 2
    Apply patch patch 
    Upgrade jsondiffpatch to 0.7.6

    ステージング環境で 0.7.6 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

npm jsondiffpatch
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.6"}]}]

References

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