Buffer Overflow in jq Command-Line JSON Processor
CVE-2026-41257

6.4MEDIUM

Key Information:

Vendor

Jqlang

Status
Jq
Vendor
CVE Published:
11 May 2026

What is CVE-2026-41257?

The jq command-line JSON processor has a vulnerability in its bytecode VM related to how the data stack tracks allocation size. In versions 1.8.1 and earlier, an integer overflow can occur when the stack exceeds roughly 1 GiB due to deeply nested generator forks. This can lead to the wrapped value being incorrectly passed to realloc, which subsequently affects a memmove operation using offsets influenced by an attacker. It poses a risk to data integrity and system security.

Affected Version(s)

jq <= 1.8.1

References

https://github.com/jqlang/jq/security/advisories/GHSA-4jm...
x_refsource_CONFIRM

CVSS V4

Score:
6.4
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.