DEBIAN-CVE-2025-34468

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Source
https://security-tracker.debian.org/tracker/CVE-2025-34468
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-34468.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2025-34468
Upstream
Published
2025-12-31T19:15:43Z
Modified
2026-09-01T20:05:46Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).

References

Affected packages

Debian:12 / libcoap3

Package

Name
libcoap3
Purl
pkg:deb/debian/libcoap3?arch=source&distro=bookworm

Affected ranges

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

Affected versions

4.*
4.3.1-1
4.3.1-2
4.3.3-1
4.3.4-1
4.3.4-1.1~exp1
4.3.4-1.1
4.3.5-1
4.3.5-2
4.3.5-3
4.3.5-4

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-34468.json"

Debian:13 / libcoap3

Package

Name
libcoap3
Purl
pkg:deb/debian/libcoap3?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.3.4-1.1+deb13u3

Affected versions

4.*
4.3.4-1.1
4.3.4-1.1+deb13u1
4.3.4-1.1+deb13u2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-34468.json"

Debian:14 / libcoap3

Package

Name
libcoap3
Purl
pkg:deb/debian/libcoap3?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.3.5-3

Affected versions

4.*
4.3.4-1.1
4.3.5-1
4.3.5-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-34468.json"