Amazon Linux 2023 Security Advisory: ALAS2023-2026-1633
Advisory Released Date: 2026-04-30
Advisory Updated Date: 2026-04-30
Severity:
Important
Issue Overview:
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. (CVE-2026-40170)
Affected Packages:
ngtcp2
Issue Correction:
Run dnf update ngtcp2 --releasever 2023.11.20260427 or dnf update --advisory ALAS2023-2026-1633 --releasever 2023.11.20260427 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
aarch64:
ngtcp2-crypto-ossl-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-debugsource-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-crypto-gnutls-devel-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-devel-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-crypto-ossl-debuginfo-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-crypto-gnutls-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-debuginfo-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-crypto-gnutls-debuginfo-1.21.0-1.amzn2023.0.2.aarch64
ngtcp2-crypto-ossl-devel-1.21.0-1.amzn2023.0.2.aarch64
noarch:
ngtcp2-doc-1.21.0-1.amzn2023.0.2.noarch
src:
ngtcp2-1.21.0-1.amzn2023.0.2.src
x86_64:
ngtcp2-crypto-ossl-debuginfo-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-debugsource-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-debuginfo-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-devel-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-crypto-gnutls-debuginfo-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-crypto-gnutls-devel-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-crypto-gnutls-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-crypto-ossl-devel-1.21.0-1.amzn2023.0.2.x86_64
ngtcp2-crypto-ossl-1.21.0-1.amzn2023.0.2.x86_64