UBUNTU-CVE-2026-39956

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Source
https://ubuntu.com/security/CVE-2026-39956
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39956.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-39956
Upstream
  • CVE-2026-39956
Downstream
Related
Published
2026-04-13T23:16:00Z
Modified
2026-05-20T16:25:38.521887904Z
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
  • Ubuntu - medium
Summary
[none]
Details

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 jvstringindexes() without verifying they are strings, and jvstring_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.

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-2026-39956.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-2026-39956.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-2026-39956.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-2026-39956.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-2026-39956.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-2026-39956.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-2026-39956.json"