DEBIAN-CVE-2026-81665

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Source
https://security-tracker.debian.org/tracker/CVE-2026-81665
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81665.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-81665
Upstream
  • CVE-2026-81665
Published
2026-09-04T09:17:11Z
Modified
2026-09-19T22:47:41Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control.

References

Affected packages

Debian:12 / corosync

Package

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

Affected ranges

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

Affected versions

3.*
3.1.7-1
3.1.7-1+deb12u1
3.1.7-1+deb12u2
3.1.8-1
3.1.8-2
3.1.8-3
3.1.9-1
3.1.9-2
3.1.10-1
3.1.10-2
3.1.10-3
3.1.10-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81665.json"

Debian:13 / corosync

Package

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

Affected ranges

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

Affected versions

3.*
3.1.9-2
3.1.9-2+deb13u1
3.1.10-1
3.1.10-2
3.1.10-3
3.1.10-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81665.json"

Debian:14 / corosync

Package

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

Affected ranges

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

Affected versions

3.*
3.1.9-2
3.1.10-1
3.1.10-2
3.1.10-3
3.1.10-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81665.json"