VulnerabilityAnalyzed
CVE-2026-41257
When the stack grows beyond ≈1 GiB (via deeply nested generator forks), the doubling arithmetic overflows.
MEDIUM 6.4EPSS 0.14%
Does this matter?
Lower severity and a low EPSS score (0.14%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 6.4 MEDIUMCVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190, CWE-787
- Affected
- jqlang/jq
- Source
- security-advisories@github.com
References
- https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539Exploit, Mitigation, Vendor Advisory
- https://github.com/jqlang/jq/security/advisories/GHSA-4jm8-m363-4539Exploit, Mitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.