CVE-2026-77415Public exploitNetwork attack vector

Host code execution via forged lambda state

Published Aug 21, 2026 · Updated Aug 25, 2026

Code injection in JSONata before 1.8.8 and 2.0.0 through 2.2.0 allows attackers to execute code via crafted expressions. Transform evaluation permits $clone replacement, wildcard access exposes function internals, and applyProcedure trusts a replaceable forEach before forged lambda state reaches prototype constructors. Exploitation requires an application to evaluate attacker-controlled expressions and executes with the host process's privileges.

CVSS severity9.3
Critical
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in JSONata before 1.8.8 and 2.0.0 through 2.2.0 allows attackers to execute code via crafted expressions. Transform evaluation permits $clone replacement, wildcard access exposes function internals, and applyProcedure trusts a replaceable forEach before forged lambda state reaches prototype constructors. Exploitation requires an application to evaluate attacker-controlled expressions and executes with the host process's privileges.

The record

CVE
CVE-2026-77415
Published
Aug 21, 2026
Updated
Aug 25, 2026
Vendor
JSONata
Product
JSONata
Classifications
CWE-94, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.8
  2. Affected versionversion=>= 2.0.0, < 2.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JSONata · JSONataversion=< 1.8.8; version=>= 2.0.0, < 2.2.1

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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