CVE-2026-41257

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.

Database specific

{
    "cwe_ids": [
        "CWE-190",
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41257.json",
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/jqlang/jq

Affected ranges

Type

GIT

Repo

https://github.com/jqlang/jq

Events

Introduced

Last affected

4467af7068b1bcd7f882defff6e7ea674c5357f4

Database specific

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.8.1"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

1.*

1.6rc2

jq-1.*

jq-1.0

jq-1.1

jq-1.2

jq-1.3

jq-1.4

jq-1.5rc1

jq-1.5rc2

jq-1.6

jq-1.6rc1

jq-1.7

jq-1.7.1

jq-1.7rc1

jq-1.7rc2

jq-1.8.0

jq-1.8.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41257.json"