[USN-8300-1] ngtcp2 vulnerability

========================================================================== Ubuntu Security Notice USN-8300-1 May 25, 2026 ngtcp2 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: ngtcp2 could be made to run programs as your login if it received specially crafted network traffic when qlog was enabled. Software Description: - ngtcp2: RFC9000 QUIC protocol implementation Details: Zou Dikai discovered that ngtcp2 serialized peer transport parameters into a fixed 1024-byte stack buffer without bounds checking. When qlog was enabled, a remote attacker could possibly use this issue to execute arbitrary code. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS libngtcp2-16 1.16.0-1ubuntu0.1 libngtcp2-crypto-gnutls-dev 1.16.0-1ubuntu0.1 libngtcp2-crypto-gnutls8 1.16.0-1ubuntu0.1 libngtcp2-crypto-ossl-dev 1.16.0-1ubuntu0.1 libngtcp2-crypto-ossl0 1.16.0-1ubuntu0.1 libngtcp2-dev 1.16.0-1ubuntu0.1 Ubuntu 25.10 libngtcp2-16 1.11.0-1+deb13u1build0.25.10.1 libngtcp2-crypto-gnutls-dev 1.11.0-1+deb13u1build0.25.10.1 libngtcp2-crypto-gnutls8 1.11.0-1+deb13u1build0.25.10.1 libngtcp2-dev 1.11.0-1+deb13u1build0.25.10.1 ngtcp2-client 1.11.0-1+deb13u1build0.25.10.1 ngtcp2-server 1.11.0-1+deb13u1build0.25.10.1 Ubuntu 24.04 LTS libngtcp2-9 0.12.1+dfsg-1+deb12u1build0.24.04.1 libngtcp2-crypto-gnutls-dev 0.12.1+dfsg-1+deb12u1build0.24.04.1 libngtcp2-crypto-gnutls2 0.12.1+dfsg-1+deb12u1build0.24.04.1 libngtcp2-dev 0.12.1+dfsg-1+deb12u1build0.24.04.1 ngtcp2-client 0.12.1+dfsg-1+deb12u1build0.24.04.1 ngtcp2-server 0.12.1+dfsg-1+deb12u1build0.24.04.1 Ubuntu 22.04 LTS libngtcp2-0 0.1.0+dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro libngtcp2-crypto-gnutls-dev 0.1.0+dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro libngtcp2-crypto-gnutls0 0.1.0+dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro libngtcp2-dev 0.1.0+dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro ngtcp2-client 0.1.0+dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro ngtcp2-server 0.1.0+dfsg-1ubuntu0.1~esm1 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8300-1 CVE-2026-40170 Package Information: https://launchpad.net/ubuntu/+source/ngtcp2/1.16.0-1ubuntu0.1 https://launchpad.net/ubuntu/+source/ngtcp2/1.11.0-1+deb13u1build0.25.10.1 https://launchpad.net/ubuntu/+source/ngtcp2/0.12.1+dfsg-1+deb12u1build0.24.04.1