DEBIAN-CVE-2025-34468
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).
DEBIAN-CVE-2025-34468
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2025-34468
libcoap3
Source reference: /affected/0/package/name
- Affected versions
- 4.3.1-1
Source reference:
/affected/0/versions4.3.1-2Source reference:
/affected/0/versions4.3.3-1Source reference:
/affected/0/versions4.3.4-1Source reference:
/affected/0/versions4.3.4-1.1Source reference:
/affected/0/versions4.3.4-1.1~exp1Source reference:
/affected/0/versions4.3.5-1Source reference:
/affected/0/versions4.3.5-2Source reference:
/affected/0/versions4.3.5-3Source reference:
/affected/0/versions4.3.5-4Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
libcoap3
Source reference: /affected/1/package/name
- Affected versions
- 4.3.4-1.1
Source reference:
/affected/1/versions4.3.4-1.1+deb13u1Source reference:
/affected/1/versions4.3.4-1.1+deb13u2Source reference:
/affected/1/versions - Fixed versions
- 4.3.4-1.1+deb13u3
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
libcoap3
Source reference: /affected/2/package/name
- Affected versions
- 4.3.4-1.1
Source reference:
/affected/2/versions4.3.5-1Source reference:
/affected/2/versions4.3.5-2Source reference:
/affected/2/versions - Fixed versions
- 4.3.5-3
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libcoap3",
"purl": "pkg:deb/debian/libcoap3?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.3.1-1",
"4.3.1-2",
"4.3.3-1",
"4.3.4-1",
"4.3.4-1.1",
"4.3.4-1.1~exp1",
"4.3.5-1",
"4.3.5-2",
"4.3.5-3",
"4.3.5-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-34468.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.3.4-1.1+deb13u3"
}
]
}
],
"package": {
"name": "libcoap3",
"purl": "pkg:deb/debian/libcoap3?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.3.4-1.1",
"4.3.4-1.1+deb13u1",
"4.3.4-1.1+deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-34468.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.3.5-3"
}
]
}
],
"package": {
"name": "libcoap3",
"purl": "pkg:deb/debian/libcoap3?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.3.4-1.1",
"4.3.5-1",
"4.3.5-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-34468.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #6096 · Revision 1
- Added to Heist Feed
- Publisher date