ALPINE-CVE-2026-40170
ngtcp2 is a C implementation of the IETF QUIC protocol. In versions prior to 1.22.1, ngtcp2_qlog_parameters_set_transport_params() serializes peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog is enabled, a remote peer can send sufficiently large transport parameters during the QUIC handshake to cause writes beyond the buffer boundary, resulting in a stack buffer overflow. This affects deployments that enable the qlog callback and process untrusted peer transport parameters. This issue has been fixed in version 1.22.1. If developers are unable to immediately upgrade, they can disable the qlog on client.
ALPINE-CVE-2026-40170
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:ALPINE-CVE-2026-40170
ngtcp2
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.5.0-r1
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
ngtcp2
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.9.1-r1
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
ngtcp2
Source reference: /affected/2/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.12.0-r1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
ngtcp2
Source reference: /affected/3/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.22.1-r0
Source reference:
/affected/3/ranges - Prerequisites
- Not stated in this record
ngtcp2
Source reference: /affected/4/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 1.22.1-r0
Source reference:
/affected/4/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"
},
{
"fixed": "1.5.0-r1"
}
]
}
],
"package": {
"name": "ngtcp2",
"purl": "pkg:apk/alpine/ngtcp2?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40170.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.9.1-r1"
}
]
}
],
"package": {
"name": "ngtcp2",
"purl": "pkg:apk/alpine/ngtcp2?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40170.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.12.0-r1"
}
]
}
],
"package": {
"name": "ngtcp2",
"purl": "pkg:apk/alpine/ngtcp2?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40170.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.1-r0"
}
]
}
],
"package": {
"name": "ngtcp2",
"purl": "pkg:apk/alpine/ngtcp2?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40170.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.1-r0"
}
]
}
],
"package": {
"name": "ngtcp2",
"purl": "pkg:apk/alpine/ngtcp2?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40170.json"
},
"ecosystem_specific": {}
}
]Publisher severity
No explicit severity was provided.
- Event
- #54337 · Revision 1
- Added to Heist Feed
- Publisher date