Linux · Amazon Linux · Security advisory · April 27, 2026

ALAS2023-2026-1633: Security update for 11 packages

ALAS2023-2026-1633, released April 27, 2026, fixes 1 CVE across 11 products. None of them is reported as exploited. Patch Radar priority: High.

High
CVEs closed
1
None rated Critical
Exploited
0
None reported
Highest CVSS
9.0
Base score, 0 to 10
Highest EPSS
0.0078
56th percentile

Fixed package versions

ProductReleaseFixed in
ngtcp2amzn 20231.21.0-1.amzn2023.0.2
ngtcp2-crypto-gnutlsamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-crypto-gnutls-debuginfoamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-crypto-gnutls-develamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-crypto-osslamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-crypto-ossl-debuginfoamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-crypto-ossl-develamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-debuginfoamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-debugsourceamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-develamzn 20231.21.0-1.amzn2023.0.2
ngtcp2-docamzn 20231.21.0-1.amzn2023.0.2

CVEs this fix closes

PriorityCVETitleCVSSEPSSExploitation
High CVE-2026-40170 ngtcp2: ngtcp2 is a C implementation of the IETF QUIC protocol9.0 0.0078 None reported
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