UBUNTU-CVE-2026-39979

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Source
https://ubuntu.com/security/CVE-2026-39979
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-39979
Upstream
Downstream
Related
Published
2026-04-13T23:16:00Z
Modified
2026-06-30T18:18:00Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

jq is a command-line JSON processor. In commits before 2f09060afab23fe9390cce7cb860b10416e1bf5f, the jv_parse_sized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jv_string_fmt(), which reads until a NUL terminator is found rather than respecting the caller-supplied length. This means that when malformed JSON is passed in a non-NUL-terminated buffer, the error construction logic performs an out-of-bounds read past the end of the buffer. The vulnerability is reachable by any libjq consumer calling jv_parse_sized() with untrusted input, and depending on memory layout, can result in memory disclosure or process termination. The issue has been patched in commit 2f09060afab23fe9390cce7cb860b10416e1bf5f.

References

Affected packages

Ubuntu:22.04:LTS
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.6-2.1ubuntu3.2

Affected versions

1.*
1.6-2.1ubuntu2
1.6-2.1ubuntu3
1.6-2.1ubuntu3.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.6-2.1ubuntu3.2"
        },
        {
            "binary_name": "libjq1",
            "binary_version": "1.6-2.1ubuntu3.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"
Ubuntu:24.04:LTS
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.7.1-3ubuntu0.24.04.2

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.7.1-3ubuntu0.24.04.2"
        },
        {
            "binary_name": "libjq1",
            "binary_version": "1.7.1-3ubuntu0.24.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"
Ubuntu:25.10
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.8.1-3ubuntu1.1

Affected versions

1.*
1.7.1-3ubuntu1
1.7.1-6ubuntu1
1.8.1-3ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.8.1-3ubuntu1.1"
        },
        {
            "binary_name": "libjq1",
            "binary_version": "1.8.1-3ubuntu1.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"
Ubuntu:26.04:LTS
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.8.1-4ubuntu2

Affected versions

1.*
1.8.1-3ubuntu1
1.8.1-4ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.8.1-4ubuntu2"
        },
        {
            "binary_name": "libjq1",
            "binary_version": "1.8.1-4ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"
Ubuntu:Pro:14.04:LTS
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.3-1.1ubuntu1.1+esm4

Affected versions

1.*
1.2-8
1.3-1
1.3-1.1ubuntu1
1.3-1.1ubuntu1.1
1.3-1.1ubuntu1.1+esm3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.3-1.1ubuntu1.1+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"
Ubuntu:Pro:16.04:LTS
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.5+dfsg-1ubuntu0.1+esm4

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.5+dfsg-1ubuntu0.1+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"
Ubuntu:Pro:18.04:LTS
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.5+dfsg-2ubuntu0.1~esm2

Affected versions

1.*
1.5+dfsg-2
1.5+dfsg-2ubuntu0.1~esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.5+dfsg-2ubuntu0.1~esm2"
        },
        {
            "binary_name": "libjq1",
            "binary_version": "1.5+dfsg-2ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"
Ubuntu:Pro:20.04:LTS
jq

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.6-1ubuntu0.20.04.1+esm2

Affected versions

1.*
1.5+dfsg-2build1
1.6-1
1.6-1ubuntu0.20.04.1
1.6-1ubuntu0.20.04.1+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "jq",
            "binary_version": "1.6-1ubuntu0.20.04.1+esm2"
        },
        {
            "binary_name": "libjq1",
            "binary_version": "1.6-1ubuntu0.20.04.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39979.json"