Amazon Linux 2 Security Advisory: ALAS2NITRO-ENCLAVES-2026-114
Advisory Released Date: 2026-07-08
Advisory Updated Date: 2026-07-08
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:
containerd
Note:
This advisory is applicable to Amazon Linux 2 - Nitro-enclaves Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update containerd or yum update --advisory ALAS2NITRO-ENCLAVES-2026-114 to update your system.
aarch64:
containerd-2.1.9-1.amzn2.0.1.aarch64
containerd-stress-2.1.9-1.amzn2.0.1.aarch64
containerd-debuginfo-2.1.9-1.amzn2.0.1.aarch64
src:
containerd-2.1.9-1.amzn2.0.1.src
x86_64:
containerd-2.1.9-1.amzn2.0.1.x86_64
containerd-stress-2.1.9-1.amzn2.0.1.x86_64
containerd-debuginfo-2.1.9-1.amzn2.0.1.x86_64