Debian dsa-6222 : libngtcp2-16 - security update

high Nessus Plugin ID 309081

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6222 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6222-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff April 21, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : ngtcp2 CVE ID : CVE-2026-40170

Zou Dikai discovered a buffer overflow in ngtcp2, a QUIC protocol library.

For the oldstable distribution (bookworm), this problem has been fixed in version 0.12.1+dfsg-1+deb12u1.

For the stable distribution (trixie), this problem has been fixed in version 1.11.0-1+deb13u1.

We recommend that you upgrade your ngtcp2 packages.

For the detailed security status of ngtcp2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/ngtcp2

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: [email protected]

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the libngtcp2-16 packages.

Plugin Details

Severity: High

ID: 309081

File Name: debian_DSA-6222.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 4/21/2026

Updated: 4/21/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-40170

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:libngtcp2-16, p-cpe:/a:debian:debian_linux:libngtcp2-9, p-cpe:/a:debian:debian_linux:libngtcp2-crypto-gnutls-dev, p-cpe:/a:debian:debian_linux:libngtcp2-crypto-gnutls2, p-cpe:/a:debian:debian_linux:libngtcp2-crypto-gnutls8, p-cpe:/a:debian:debian_linux:libngtcp2-dev, p-cpe:/a:debian:debian_linux:ngtcp2-client, p-cpe:/a:debian:debian_linux:ngtcp2-server

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 4/21/2026

Vulnerability Publication Date: 4/16/2026

Reference Information

CVE: CVE-2026-40170

Detections

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