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
ALPINE (1)
AZL (1)
BELL (1)
CLEANSTART (1)
CLSA (2)
DEBIAN (1)
ECHO (1)
MGASA (1)
OESA (5)
openSUSE (2)
RHSA (1)
SUSE (5)
UBUNTU (1)
Related
openSUSE (2)
SUSE (5)
Published
2026-05-11T17:20:06Z
Modified
2026-10-28T02:30:24Z
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",
    "cwe_ids": [
        "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43894.json"
}
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 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "last_affected": "1.8.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "cpe": "cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "last_affected": "1.8.1"
                }
            ],
            "source": "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"