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ngtcp2: ngtcp2: Denial of service via stack buffer overflow during QUIC handshake

🗓️ 03 Jun 2026 21:52:33Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 10 Views

ngtcp2 denial of service via stack overflow during QUIC handshake with large untrusted transport parameters and qlog callback enabled.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux10.2aarch64ctdb-debuginfo4.23.5-109.el10_2ctdb-debuginfo-4.23.5-109.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64lectdb-debuginfo4.23.5-109.el10_2ctdb-debuginfo-4.23.5-109.el10_2.ppc64le.rpm
Red Hat Enterprise Linux10.2s390xctdb-debuginfo4.23.5-109.el10_2ctdb-debuginfo-4.23.5-109.el10_2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64ctdb-debuginfo4.23.5-109.el10_2ctdb-debuginfo-4.23.5-109.el10_2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64ldb-tools4.23.5-109.el10_2ldb-tools-4.23.5-109.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64leldb-tools4.23.5-109.el10_2ldb-tools-4.23.5-109.el10_2.ppc64le.rpm
Red Hat Enterprise Linux10.2s390xldb-tools4.23.5-109.el10_2ldb-tools-4.23.5-109.el10_2.s390x.rpm
Red Hat Enterprise Linux10.2x86_64ldb-tools4.23.5-109.el10_2ldb-tools-4.23.5-109.el10_2.x86_64.rpm
Red Hat Enterprise Linux10.2aarch64ldb-tools-debuginfo4.23.5-109.el10_2ldb-tools-debuginfo-4.23.5-109.el10_2.aarch64.rpm
Red Hat Enterprise Linux10.2ppc64leldb-tools-debuginfo4.23.5-109.el10_2ldb-tools-debuginfo-4.23.5-109.el10_2.ppc64le.rpm
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03 Jul 2026 00:52Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.17.5
EPSS0.00776
SSVC
10