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DEBIAN-CVE-2026-40170

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-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:DEBIAN-CVE-2026-40170

ngtcp2

Source reference: /affected/0/package/name

Affected versions
0.12.1+dfsg-1

Source reference: /affected/0/versions

Fixed versions
0.12.1+dfsg-1+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

ngtcp2

Source reference: /affected/1/package/name

Affected versions
1.11.0-1

Source reference: /affected/1/versions

Fixed versions
1.11.0-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

ngtcp2

Source reference: /affected/2/package/name

Affected versions
1.11.0-1

Source reference: /affected/2/versions

1.12.0-1~exp1

Source reference: /affected/2/versions

1.15.1-1

Source reference: /affected/2/versions

1.16.0-1

Source reference: /affected/2/versions

1.16.0-1~bpo13+1

Source reference: /affected/2/versions

1.16.0-1~bpo13+2

Source reference: /affected/2/versions

1.16.0-1~exp1

Source reference: /affected/2/versions

1.21.0-1

Source reference: /affected/2/versions

1.22.1-1~bpo13+1

Source reference: /affected/2/versions

Fixed versions
1.22.1-1

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"
          },
          {
            "fixed": "0.12.1+dfsg-1+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "ngtcp2",
      "purl": "pkg:deb/debian/ngtcp2?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "0.12.1+dfsg-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40170.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.11.0-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "ngtcp2",
      "purl": "pkg:deb/debian/ngtcp2?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.11.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40170.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.22.1-1"
          }
        ]
      }
    ],
    "package": {
      "name": "ngtcp2",
      "purl": "pkg:deb/debian/ngtcp2?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.11.0-1",
      "1.12.0-1~exp1",
      "1.15.1-1",
      "1.16.0-1",
      "1.16.0-1~bpo13+1",
      "1.16.0-1~bpo13+2",
      "1.16.0-1~exp1",
      "1.21.0-1",
      "1.22.1-1~bpo13+1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40170.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56012 · Revision 1
Added to Heist Feed
Publisher date
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