Upstream information

CVE-2026-40170 at MITRE

Description

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.

SUSE information

Overall state of this security issue: Does not affect SUSE products

SUSE Bugzilla entry: 1262273 [NEW]

No SUSE Security Announcements cross referenced.

List of released packages

Product(s) Fixed package version(s) References
openSUSE Tumbleweed
  • libngtcp2-16 >= 1.22.1-1.1
  • libngtcp2-16-32bit >= 1.22.0-2.1
  • libngtcp2_crypto_gnutls-devel >= 1.22.1-1.1
  • libngtcp2_crypto_gnutls8 >= 1.22.1-1.1
  • libngtcp2_crypto_gnutls8-32bit >= 1.22.0-2.1
  • libngtcp2_crypto_ossl-devel >= 1.22.1-1.1
  • libngtcp2_crypto_ossl0 >= 1.22.1-1.1
  • libngtcp2_crypto_ossl0-32bit >= 1.22.0-2.1
  • ngtcp2-devel >= 1.22.1-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10621

SUSE Timeline for this CVE

CVE page created: Fri Apr 17 02:00:33 2026
CVE page last modified: Fri May 8 12:08:58 2026