Amazon Linux 2023 Security Advisory: ALAS2023-2026-1908
Advisory Released Date: 2026-07-07
Advisory Updated Date: 2026-07-07
FAQs regarding Amazon Linux ALAS/CVE Severity
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates. (CVE-2026-27145)
Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU. (CVE-2026-42504)
When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged. (CVE-2026-42507)
Affected Packages:
nerdctl
Issue Correction:
Run dnf update nerdctl --releasever 2023.12.20260706 or dnf update --advisory ALAS2023-2026-1908 --releasever 2023.12.20260706 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
nerdctl-2.2.2-1.amzn2023.0.4.aarch64
src:
nerdctl-2.2.2-1.amzn2023.0.4.src
x86_64:
nerdctl-2.2.2-1.amzn2023.0.4.x86_64