UBUNTU-CVE-2026-43894

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2026-43894

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-43894

Upstream

CVE-2026-43894

Published

2026-05-11T18:16:00Z

Modified

2026-05-21T06:15:07.593010998Z

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
5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

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).

References

Affected packages

Ubuntu:22.04:LTS

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.6-2.1ubuntu2

1.6-2.1ubuntu3

1.6-2.1ubuntu3.1

1.6-2.1ubuntu3.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.6-2.1ubuntu3.2",
            "binary_name": "jq"
        },
        {
            "binary_version": "1.6-2.1ubuntu3.2",
            "binary_name": "libjq1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"

Ubuntu:24.04:LTS

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.6-3

1.7-1

1.7.1-2

1.7.1-3

1.7.1-3build1

1.7.1-3ubuntu0.24.04.1

1.7.1-3ubuntu0.24.04.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.7.1-3ubuntu0.24.04.2",
            "binary_name": "jq"
        },
        {
            "binary_version": "1.7.1-3ubuntu0.24.04.2",
            "binary_name": "libjq1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"

Ubuntu:25.10

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.7.1-3ubuntu1

1.7.1-6ubuntu1

1.8.1-3ubuntu1

1.8.1-3ubuntu1.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.8.1-3ubuntu1.1",
            "binary_name": "jq"
        },
        {
            "binary_version": "1.8.1-3ubuntu1.1",
            "binary_name": "libjq1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"

Ubuntu:26.04:LTS

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.8.1-3ubuntu1

1.8.1-4ubuntu1

1.8.1-4ubuntu2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.8.1-4ubuntu2",
            "binary_name": "jq"
        },
        {
            "binary_version": "1.8.1-4ubuntu2",
            "binary_name": "libjq1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"

Ubuntu:Pro:14.04:LTS

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.2-8

1.3-1

1.3-1.1ubuntu1

1.3-1.1ubuntu1.1

1.3-1.1ubuntu1.1+esm3

1.3-1.1ubuntu1.1+esm4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.3-1.1ubuntu1.1+esm4",
            "binary_name": "jq"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"

Ubuntu:Pro:16.04:LTS

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.4-2.1

1.5+dfsg-1

1.5+dfsg-1ubuntu0.1

1.5+dfsg-1ubuntu0.1+esm2

1.5+dfsg-1ubuntu0.1+esm3

1.5+dfsg-1ubuntu0.1+esm4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.5+dfsg-1ubuntu0.1+esm4",
            "binary_name": "jq"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"

Ubuntu:Pro:18.04:LTS

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.5+dfsg-2

1.5+dfsg-2ubuntu0.1~esm1

1.5+dfsg-2ubuntu0.1~esm2

1.5+dfsg-2ubuntu0.1~esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.5+dfsg-2ubuntu0.1~esm3",
            "binary_name": "jq"
        },
        {
            "binary_version": "1.5+dfsg-2ubuntu0.1~esm3",
            "binary_name": "libjq1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"

Ubuntu:Pro:20.04:LTS

Package

Name: jq
Purl: pkg:deb/ubuntu/jq?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.5+dfsg-2build1

1.6-1

1.6-1ubuntu0.20.04.1

1.6-1ubuntu0.20.04.1+esm1

1.6-1ubuntu0.20.04.1+esm2

1.6-1ubuntu0.20.04.1+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1.6-1ubuntu0.20.04.1+esm3",
            "binary_name": "jq"
        },
        {
            "binary_version": "1.6-1ubuntu0.20.04.1+esm3",
            "binary_name": "libjq1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43894.json"