Detections
Analytics
Amazon Linux 2 : containerd, --advisory ALAS2DOCKER-2026-135 (ALASDOCKER-2026-135)
medium Nessus Plugin ID 325582
Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
The version of containerd installed on the remote host is prior to 2.1.9-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2DOCKER-2026-135 advisory.(*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)
Tenable has extracted the preceding description block directly from the tested product security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Run 'yum update containerd' or or 'yum update --advisory ALAS2DOCKER-2026-135' to update your system.See Also
https://alas.aws.amazon.com//AL2/ALAS2DOCKER-2026-135.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2026-27145.html
Plugin Details
Severity: Medium
ID: 325582
File Name: al2_ALASDOCKER-2026-135.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 7/8/2026
Updated: 7/8/2026
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5
Percentile: 94.15
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 4.5
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:C
CVSS Score Source: CVE-2026-27145
CVSS v3
Risk Factor: Medium
Base Score: 5.3
Temporal Score: 4.6
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: CVE-2026-42507
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:containerd-stress, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:containerd, p-cpe:/a:amazon:linux:containerd-debuginfo
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 7/8/2026
Vulnerability Publication Date: 6/2/2026
Reference Information
CVE: CVE-2026-27145, CVE-2026-42504, CVE-2026-42507
IAVB: 2026-B-0146