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CVE-2026-81849— Path traversal in the aws:downloadContent plugin in amazon-ssm-agent

Quick assessment

Affected
amazon amazon-ssm-agent
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 amazon-ssm-agent 3.3.4515.0 之前的 插件中，由于未将路径名严格限制在指定目录内，可能存在路径遍历漏洞。攻击者（一个拥有 权限且该权限仅被限制在 AWS-DownloadContent 文档的已认证远程用户）可以通过构造 S3 源中的对象键（object key），利用 root 权限在预期下载目录之外写入任意文件。如果某些敏感系统文件被覆盖，可能导致以 root 权限执行任意代码。 要修复此问题，建议客户将 amazon-ssm-agent 升级至 3.3.4515.0 或更高版本。

CVSS 8.8 · High EPSS 0.57% · P45

Affected Version Matrix 1

VendorProduct Version RangeStatus
amazon amazon-ssm-agent < 3.3.4515.0 affected
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I. Basic Information for CVE-2026-81849

Vulnerability Information
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Vulnerability Title
Path traversal in the aws:downloadContent plugin in amazon-ssm-agent
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
amazon amazon-ssm-agent 0 ~ 3.3.4515.0 -

II. Public POCs for CVE-2026-81849

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III. Intelligence Information for CVE-2026-81849

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Vendor Pages for CVE-2026-81849 (2)

IV. Related Vulnerabilities

Same vendor: amazon
Same weakness: CWE-23

V. Comments for CVE-2026-81849

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