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
  • CVE-2026-39979
Downstream
Related
Published
2026-04-13T23:16:00Z
Modified
2026-05-20T16:25:38.510802597Z
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
  • 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 jvparsesized() API in libjq accepts a counted buffer with an explicit length parameter, but its error-handling path formats the input buffer using %s in jvstringfmt(), 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 jvparsesized() 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
0Unknown 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
0Unknown 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
0Unknown 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
0Unknown 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
0Unknown 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
0Unknown 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
0Unknown 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
0Unknown 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"