JSON Parser Vulnerability in jqlang jq Affects Versions Up to 1.6
CVE-2025-9403

4.8MEDIUM

Key Information:

Vendor

Jqlang

Status
Jq
Vendor
CVE Published:
25 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-9403?

A vulnerability has been identified in jqlang jq, specifically in the JSON Parser component located in the run_jq_tests function of the jq_test.c file. This flaw allows for an assertion failure that can be triggered through local manipulation. The issue requires local access to exploit and has been publicly disclosed, making it imperative for users of affected versions, including jqlang jq up to version 1.6, to take precautionary measures. Additional versions may also be susceptible.

Affected Version(s)

jq 1.0

jq 1.1

jq 1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-9403 - Proof of Concept

References

https://vuldb.com/?id.321239
vdb-entrytechnical-description
https://vuldb.com/?ctiid.321239
signaturepermissions-required
https://vuldb.com/?submit.633170
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

xdcao (VulDB User)
.
CVE-2025-9403 : JSON Parser Vulnerability in jqlang jq Affects Versions Up to 1.6