DEBIAN-CVE-2026-43894

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Source
https://security-tracker.debian.org/tracker/CVE-2026-43894
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43894.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-43894
Upstream
Published
2026-05-11T18:16:37Z
Modified
2026-09-01T16:06:44Z
Severity
  • 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
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

Debian:12 / jq

Package

Name
jq
Purl
pkg:deb/debian/jq?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.6-2.1+deb12u2

Affected versions

1.*
1.6-2.1
1.6-2.1+deb12u1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43894.json"

Debian:13 / jq

Package

Name
jq
Purl
pkg:deb/debian/jq?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.7.1-6+deb13u3

Affected versions

1.*
1.7.1-6+deb13u1
1.7.1-6+deb13u2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43894.json"

Debian:14 / jq

Package

Name
jq
Purl
pkg:deb/debian/jq?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.8.1-6

Affected versions

1.*
1.8.0-1
1.8.1-1
1.8.1-2
1.8.1-3
1.8.1-4
1.8.1-5

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43894.json"