Out-of-bounds read in jq - CVE-2026-39979
Published: April 13, 2026 / Updated: April 13, 2026
Vulnerability identifier: #VU125830
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2026-39979
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: stedolan (Stephen Dolan)
Affected software:
jq
jq
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to a boundary condition in the "jv_parse_sized()" function. A remote attacker can trigger an out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.
How to mitigate CVE-2026-39979
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.