SB2026051149 - Denial of service in jqlang jq

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Main Vulnerability Database SB2026051149

SB2026051149 - Denial of service in jqlang jq

Published: May 11, 2026

Security Bulletin ID SB2026051149
CSH Severity
Low
Patch available
NO
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-43894)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to out-of-bounds write in decNumber D2U() macro in decNumberFromString when processing an extremely large decimal string via tonumber. A remote attacker can supply a specially crafted number string to cause a denial of service.

The issue is triggered by signed integer overflow and is reachable through tonumber on a string built via the multiplication operator rather than through raw JSON number parsing.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References