CVE-2026-43894

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Source
https://cve.org/CVERecord?id=CVE-2026-43894
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43894.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-43894
Aliases
  • GHSA-5v7p-2r57-2g4g
Downstream
Related
Published
2026-05-11T17:20:06.055Z
Modified
2026-08-07T11:49:57.114513069Z
Severity
  • 6.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
jq: Wild stack write via signed-integer overflow in decNumber D2U() macro
Details

jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).

Database specific 
{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43894.json",
    "cwe_ids": [
        "CWE-190"
    ]
}
References

Affected packages

Git / github.com/jqlang/jq

Affected ranges

Type
GIT
Repo
https://github.com/jqlang/jq
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
4467af7068b1bcd7f882defff6e7ea674c5357f4
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.8.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

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-2026-43894.json"