CVE-2026-41257 Details
Description
jq is a command-line JSON processor. In 1.8.1 and earlier, the jq bytecode VM's data stack tracks its allocation size in a signed int. When the stack grows beyond ≈1 GiB (via deeply nested generator forks), the doubling arithmetic overflows. The wrapped value is passed to realloc and then used for a memmove with attacker-influenced offsets.
A signed integer overflow vulnerability has been identified in the jq command-line JSON processor, specifically in versions through 1.8.1. The issue arises in the bytecode virtual machine's data stack, which tracks allocation size using a signed integer. When the stack exceeds approximately 1 GiB due to deeply nested generator forks, the arithmetic overflow occurs. This wrapped value is then passed to realloc and used in a memmove operation with offsets influenced by the attacker.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539 | CISA-ADP | ExploitMitigationVendor Advisory |
| https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539 | [email protected] | ExploitMitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| jqlang jq | <= 1.8.1 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 13, 2026 | Initial Analysis | [email protected] |
| May 11, 2026 | CVE Modified | CISA-ADP |
| May 11, 2026 | New CVE Received | [email protected] |