CVE-2026-39956

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-39956
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39956.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-39956
Aliases
  • GHSA-6gc3-3g9p-xx28
Downstream
Related
Published
2026-04-13T22:10:18Z
Modified
2026-09-06T08:07:51Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H CVSS Calculator
Summary
jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure
Details

jq is a command-line JSON processor. Prior to version 1.8.2, the _strindices builtin in jq's src/builtin.c passes its arguments directly to jv_string_indexes() without verifying they are strings, and jv_string_indexes() in src/jv.c relies solely on assert() checks that are stripped in release builds compiled with -DNDEBUG. This allows an attacker to crash jq trivially with input like _strindices(0), and by crafting a numeric value whose IEEE-754 bit pattern maps to a chosen pointer, achieve a controlled pointer dereference and limited memory read/probe primitive. Any deployment that evaluates untrusted jq filters against a release build is vulnerable. This issue has been patched in commit fdf8ef0f0810e3d365cdd5160de43db46f57ed03, which is part of version 1.8.2.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125",
        "CWE-476",
        "CWE-843"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39956.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
Fixed
fdf8ef0f0810e3d365cdd5160de43db46f57ed03
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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-2026-39956.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "211916491984239188589681460148175833042",
                "340154602296692499074523450035595928275",
                "240720352413467518066581454148247975032",
                "214807881025797077317835442942205548411"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-39956-3157e7ab",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03",
        "target": {
            "file": "src/builtin.c"
        }
    }
]
vanir_signatures_modified 
"2026-09-06T08:07:51Z"