CVE-2026-41257

A flaw was found in jq, a command line JSON processor. The memory allocation size is calculated using a signed integer that can overflow when processing deeply nested generator forks. This integer overflow allows an attacker who can supply a sufficiently nested input to influence the memory allocation size, causing an out-of-bounds write and an application crash, resulting in a denial of service.

To exploit this issue, an attacker needs to supply a crafted JSON input to be processed by jq that triggers deeply nested generator forks. This allows the attacker to overflow the integer used to calculate memory size and cause an out-of-bounds write, effectively resulting in an application crash with no other security impact. Due to these reasons, this vulnerability has been rated with a moderate severity.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Do not process untrusted input with the jq command line JSON processor.