DEBIAN-CVE-2026-29035
CivetWeb (commit 4a4f0c95) contains a heap and stack buffer overflow vulnerability in the read_websocket() function that allows unauthenticated remote attackers to corrupt memory by sending compressed WebSocket frames when both USE_ZLIB and MG_EXPERIMENTAL_INTERFACES are defined. Attackers can negotiate permessage-deflate during the WebSocket handshake and send a crafted frame with the RSV1 bit set, causing the server to write a 4-byte zlib sync trailer out-of-bounds past the allocated buffer, leading to heap metadata corruption, denial of service, or potential code execution.
DEBIAN-CVE-2026-29035
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-2026-29035
civetweb
Source reference: /affected/0/package/name
- Affected versions
- 1.15+dfsg-4
Source reference:
/affected/0/versions1.16+dfsg-1Source reference:
/affected/0/versions1.16+dfsg-2Source reference:
/affected/0/versions1.16+dfsg-3Source reference:
/affected/0/versions1.16+dfsg-4Source reference:
/affected/0/versions1.16+dfsg-5Source reference:
/affected/0/versions1.16+dfsg-6Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
civetweb
Source reference: /affected/1/package/name
- Affected versions
- 1.16+dfsg-2
Source reference:
/affected/1/versions1.16+dfsg-2+deb13u1Source reference:
/affected/1/versions1.16+dfsg-3Source reference:
/affected/1/versions1.16+dfsg-4Source reference:
/affected/1/versions1.16+dfsg-5Source reference:
/affected/1/versions1.16+dfsg-6Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
civetweb
Source reference: /affected/2/package/name
- Affected versions
- 1.16+dfsg-2
Source reference:
/affected/2/versions1.16+dfsg-3Source reference:
/affected/2/versions1.16+dfsg-4Source reference:
/affected/2/versions1.16+dfsg-5Source reference:
/affected/2/versions1.16+dfsg-6Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- 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": "civetweb",
"purl": "pkg:deb/debian/civetweb?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.15+dfsg-4",
"1.16+dfsg-1",
"1.16+dfsg-2",
"1.16+dfsg-3",
"1.16+dfsg-4",
"1.16+dfsg-5",
"1.16+dfsg-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29035.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "civetweb",
"purl": "pkg:deb/debian/civetweb?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.16+dfsg-2",
"1.16+dfsg-2+deb13u1",
"1.16+dfsg-3",
"1.16+dfsg-4",
"1.16+dfsg-5",
"1.16+dfsg-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29035.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "civetweb",
"purl": "pkg:deb/debian/civetweb?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.16+dfsg-2",
"1.16+dfsg-3",
"1.16+dfsg-4",
"1.16+dfsg-5",
"1.16+dfsg-6"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-29035.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #15060 · Revision 1
- Added to Heist Feed
- Publisher date