Vulnerability-Lookup

CVE-2026-39956 (GCVE-0-2026-39956)

Vulnerability from cvelistv5 – Published: 2026-04-13 22:10 – Updated: 2026-04-14 16:28

Title

jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure

Summary

jq is a command-line JSON processor. In commits after 69785bf77f86e2ea1b4a20ca86775916889e91c9, 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.

Severity ?

6.1 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

CWE

CWE-125 - Out-of-bounds Read
CWE-476 - NULL Pointer Dereference
CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/jqlang/jq/security/advisories/…	x_refsource_CONFIRM
	https://github.com/jqlang/jq/commit/fdf8ef0f0810e…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	jqlang	jq	Affected: >= 69785bf77f86e2ea1b4a20ca86775916889e91c9, < fdf8ef0f0810e3d365cdd5160de43db46f57ed03

Show details on NVD website

JSON

To clipboard

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MSRC_CVE-2026-39956

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-17 01:02

Summary

jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-39956

6.1 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

CWE-125 - Out-of-bounds Read

None Available There is no fix available for this vulnerability as of now

References

URL

Category

	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
	https://support.microsoft.com/lifecycle	external
	https://www.first.org/cvss	external
	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
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    "notes": [
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        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
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      "contact_details": "secure@microsoft.com",
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    "references": [
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        "category": "self",
        "summary": "CVE-2026-39956 jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-39956.json"
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      {
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        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure",
    "tracking": {
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      "generator": {
        "date": "2026-04-17T07:18:25.628Z",
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      "id": "msrc_CVE-2026-39956",
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      "revision_history": [
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          "text": "GitHub_M",
          "title": "Assigning CNA"
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        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-04-17T01:02:19.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
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            "availabilityImpact": "HIGH",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "environmentalsScore": 0.0,
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 6.1,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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          ]
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      ],
      "title": "jq: Missing runtime type checks for _strindices lead to crash and limited memory disclosure"
    }
  ]
}

FKIE_CVE-2026-39956

Vulnerability from fkie_nvd - Published: 2026-04-13 23:16 - Updated: 2026-04-17 15:26

Severity ?

6.1 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03
	security-advisories@github.com	https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "jq is a command-line JSON processor. In commits after 69785bf77f86e2ea1b4a20ca86775916889e91c9, the _strindices builtin in jq\u0027s 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."
    }
  ],
  "id": "CVE-2026-39956",
  "lastModified": "2026-04-17T15:26:13.013",
  "metrics": {
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          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-13T23:16:27.653",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jqlang/jq/commit/fdf8ef0f0810e3d365cdd5160de43db46f57ed03"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/jqlang/jq/security/advisories/GHSA-6gc3-3g9p-xx28"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-476"
        },
        {
          "lang": "en",
          "value": "CWE-843"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-39956 (GCVE-0-2026-39956)

MSRC_CVE-2026-39956

FKIE_CVE-2026-39956

Tags

Sightings

Nomenclature