DEBIAN-CVE-2026-114613

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Source
https://security-tracker.debian.org/tracker/CVE-2026-114613
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-114613.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-114613
Upstream
Published
2026-10-23T13:47:26Z
Modified
2026-10-23T14:00:14Z
Summary
[none]
Details

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.3, the msgpack-python C extension (msgpack._cmsgpack) leaks a decoded map value when deserialization rejects a key with strict_map_key=True (the default). Repeated malformed inputs can cause unbounded process memory growth and denial of service in applications that deserialize attacker-controlled MessagePack data. Both unpackb() and the streaming Unpacker API are affected. The pure-Python fallback does not exhibit this leak in the reported tests. This issue is fixed in version 1.2.3.

References

Affected packages

Debian:12 / python-msgpack

Package

Name
python-msgpack
Purl
pkg:deb/debian/python-msgpack?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.3-2
1.0.3-3
1.1.2-1
1.1.2-2
1.1.2-3
1.1.2-4
1.2.1-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-114613.json"

Debian:13 / python-msgpack

Package

Name
python-msgpack
Purl
pkg:deb/debian/python-msgpack?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.3-3
1.1.2-1
1.1.2-2
1.1.2-3
1.1.2-4
1.2.1-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-114613.json"

Debian:14 / python-msgpack

Package

Name
python-msgpack
Purl
pkg:deb/debian/python-msgpack?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.3-3
1.1.2-1
1.1.2-2
1.1.2-3
1.1.2-4
1.2.1-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-114613.json"