Detections
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Amazon Linux 2023 : docker (ALAS2023-2026-3266)
high Nessus Plugin ID 371886
Synopsis
The remote Amazon Linux 2023 host is missing a security update.Description
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3266 advisory.The tar extraction routines in moby/go-archive (Unpack, UnpackLayer, Untar/UntarUncompressed, and the ApplyLayer helpers) do not confine filesystem operations to the destination directory. A crafted archive can create or overwrite files outside the intended destination. (CVE-2026-17106)
When Trailer headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a Trailer header that declares a large number of fields causing the server to allocate a disproportionate amount of memory while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits.This exploit is not applicable for HTTP/1 servers, which do not support multiplexing a large number of requests over one TCP connection, and whose Server.MaxHeaderBytes are calculated differently.Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits are now applied towards the trailer fields declared in Trailer headers.
NOTE: https://www.openwall.com/lists/oss-security/2026/10/08/9NOTE:
https://github.com/golang/go/issues/81857NOTE: Fixed by:
https://github.com/golang/go/commit/cbb0fb8b51cba866018b8a0fb4b5458f16c5c80b (go1.27.2)NOTE: Fixed by:
https://github.com/golang/go/commit/6e049521882c944afc1e519a83971ec421dc2974 (go1.26.9) (CVE-2026-78659)
When parsing a Range header containing a large number of small ranges, FileServer(FS), ServeContent, and ServeFile(FS) could consume an excessive amount of CPU.
These functions now ignore Range headers containing more than 200 ranges.The limit is controlled by the new httpservecontentmaxranges=GODEBUG setting. Setting GODEBUG=httpservecontentmaxranges=0 disables the limit.
NOTE: https://www.openwall.com/lists/oss-security/2026/10/08/9NOTE:
https://github.com/golang/go/issues/81858NOTE: Fixed by:
https://github.com/golang/go/commit/ababc3cd873d8acce1777268aa7a817e6b672028 (go1.27.2)NOTE: Fixed by:
https://github.com/golang/go/commit/eb25b4e532c5a01f99ef860ec66743a8783f992b (go1.26.9) (CVE-2026-78667)
The firewall rules which mark VXLAN datagrams for encryption indiscriminately match both authentic VXLAN datagrams sent from the kernel and forged datagrams sent by user processes. Any packet sent from the host network namespace of a Linux Swarm node is encrypted with the overlay-network IPsec parameters which meets the following criteria:
- UDP datagram- Destination port is the Swarm data-path port- Datagram starts with a VXLAN header for the VNI of an encrypted overlay network which any running container on the node is connected to (CVE-2026-92542)
Docker Engine classifies a registry hostname as insecure using an any-match DNS check.
loadInsecureRegistries() injects 127.0.0.0/8 and ::1/128 as insecure CIDRs by default. isCIDRMatch resolves all of the hostname's addresses and returns true if a single address is in the insecure CIDR list. Because the transport re-dials the hostname rather than the CIDR-matching address, a DNS answer set of one loopback IP plus a non-loopback attacker IP disables certificate verification and enables HTTP fallback for the registry connection. (CVE-2026-92543)
BuildKit may be tricked into performing file actions with special file inodes where regular files are expected. Special files may block operations or, on rootful workers, allow unintended host device access.
(CVE-2026-93320)
Parsing a multipart form could bypass memory limits and read an arbitrarily long line into memory when the remaining limit at the start of a part was less than 400 bytes. Multipart form memory limits are now properly enforced in this situation.
NOTE: https://www.openwall.com/lists/oss-security/2026/10/08/9NOTE:
https://github.com/golang/go/issues/81741NOTE: Fixed by:
https://github.com/golang/go/commit/7c79b50a74b6d1aa4269b1827dda7d81f3717f9d (go1.27.2)NOTE: Fixed by:
https://github.com/golang/go/commit/d7a7aa8e6781ddf8dce12adf60a813d957d4763e (go1.26.9) (CVE-2026-94440)
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 'dnf update docker --releasever 2023.12.20261026' or or 'dnf update --advisory ALAS2023-2026-3266 --releasever 2023.12.20261026' to update your system.See Also
https://alas.aws.amazon.com//AL2023/ALAS2023-2026-3266.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2026-17106.html
https://explore.alas.aws.amazon.com/CVE-2026-78659.html
https://explore.alas.aws.amazon.com/CVE-2026-78667.html
https://explore.alas.aws.amazon.com/CVE-2026-92542.html
https://explore.alas.aws.amazon.com/CVE-2026-92543.html
Plugin Details
Severity: High
ID: 371886
File Name: al2023_ALAS2023-2026-3266.nasl
Version: 1.1
Type: Local
Agent: unix
Published: 10/25/2026
Updated: 10/25/2026
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: High
Score: 7.7
Percentile: 98.94
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-17106
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.7
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS Score Source: CVE-2026-94440
CVSS v4
Risk Factor: High
Base Score: 7.6
Threat Score: 6.7
Threat Vector: CVSS:4.0/E:P
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score Source: CVE-2026-92543
Vulnerability Information
CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:docker-debuginfo, p-cpe:/a:amazon:linux:docker-debugsource, p-cpe:/a:amazon:linux:docker
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/24/2026
Vulnerability Publication Date: 8/18/2026
Reference Information
CVE: CVE-2026-17106, CVE-2026-78659, CVE-2026-78667, CVE-2026-92542, CVE-2026-92543, CVE-2026-93320, CVE-2026-94440
IAVB: 2026-B-0296-S