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CVE-2026-77415

Code Injection in jsonata (CVE-2026-77415)

Summary

Code injection in jsonata (CVE-2026-77415). Risk of unauthorized operations or information disclosure. Exploitable via evaluateTransformExpression. Mitigation: upgrade to 1.8.8 or later.

Original description

The description as published by the source.

Before JSONata 2.2.1 and 1.8.8 it was possible to execute arbitrary code with
crafted expressions, due to:

  • overwriting $clone allowing mutation of objects via transforms (see
    evaluateTransformExpression)
  • it being possible to destruct jsonata functions/lambdas (e.g. $merge.*)
  • applyProcedure
    using proc.arguments.forEach and not Array.prototype.forEach

Which could be chained to execute arbitrary code.

This was fixed with:

Which are included in the 2.2.1 release. Fixes were then back-ported to the 1.8.8 release.

PoC

import jsonata from "jsonata";

const expression = jsonata(`
(
    $obj := {};
    $clone := function($o) { $o };
    $m := ($merge.*)[1];

    $fn := function($a) {
        (
            $a({"value":"lg"},"__lookupGetter__");
            $a({"value":"x"},"x");
        )
    };

    $nop := function() { $ };

    $capture := function($val) {
        $obj ~> | $obj | {"x": 1, "y": 1, "lg":$lg} |
    };

    $ ~> | $ | $m([$n…

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-2026-77415 has been found in jsonata.
Attackers can target a specific entry point like evaluateTransformExpression over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade jsonata to 1.8.8 or later.
If unsure, ask your IT team or search "jsonata CVE-2026-77415" on the vendor's site.

CVE-2026-77415 (jsonata) — CWE-94
Attack surface: evaluateTransformExpression / proc.arguments.forEach / Array.prototype.forEach
Patched: 1.8.8 — 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

Arbitrary code execution (CWE-94) exists in jsonata. Attackers reach the vulnerable code path via evaluateTransformExpression.

📍 Affected scope

Check the vendor advisory for the affected versions of jsonata. Attack surface: evaluateTransformExpression / proc.arguments.forEach / Array.prototype.forEach.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 1.8.8.

🛡️ 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 'jsonata' . 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 'jsonata' . | 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 jsonata 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 jsonata to 1.8.8

    ステージング環境で 1.8.8 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 jsonata
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.8.8"}]}]

References

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