Improper limitation of a pathname to a restricted directory in the aws:downloadContent plugin in amazon-ssm-agent before 3.3.4515.0 might allow an authenticated remote user whose ssm:SendCommand permission is restricted to the AWS-DownloadContent document, to write arbitrary files outside the intended download directory with root privileges, via crafted object keys in the S3 source the document is directed to retrieve. This issue may lead to arbitrary code execution as root if specific sensitive files are overwritten. To remediate this issue, customers should upgrade amazon-ssm-agent to version 3.3.4515.0 or later.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1813 advisory.

    When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION     frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0. (CVE-2026-33814)

    Improper limitation of a pathname to a restricted directory in the aws:downloadContent plugin in amazon-     ssm-agent before 3.3.4515.0 might allow an authenticated remote user whose ssm:SendCommand permission is     restricted to the AWS-DownloadContent document, to write arbitrary files outside the intended download     directory with root privileges, via crafted object keys in the S3 source the document is directed to     retrieve. This issue may lead to arbitrary code execution as root if specific sensitive files are     overwritten.



    To remediate this issue, customers should upgrade amazon-ssm-agent to version 3.3.4515.0 or later.
    (CVE-2026-81849)

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.

The version of amazon-ssm-agent installed on the remote host is prior to 3.3.4515.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3350 advisory.

    When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION     frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0. (CVE-2026-33814)

    Improper limitation of a pathname to a restricted directory in the aws:downloadContent plugin in amazon-     ssm-agent before 3.3.4515.0 might allow an authenticated remote user whose ssm:SendCommand permission is     restricted to the AWS-DownloadContent document, to write arbitrary files outside the intended download     directory with root privileges, via crafted object keys in the S3 source the document is directed to     retrieve. This issue may lead to arbitrary code execution as root if specific sensitive files are     overwritten.



    To remediate this issue, customers should upgrade amazon-ssm-agent to version 3.3.4515.0 or later.
    (CVE-2026-81849)

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.

ID	Name	Product	Family	Type	Severity
319885	Amazon Linux 2023 : amazon-ssm-agent (ALAS2023-2026-1813)	Nessus	Amazon Linux Local Security Checks	Local	high
319796	Amazon Linux 2 : amazon-ssm-agent (ALAS-2026-3350)	Nessus	Amazon Linux Local Security Checks	Local	high

Detections

Analytics

CVE-2026-81849

high

Tenable Plugins

high

high