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CVE-2026-44885— Portainer: Path traversal in backup archive extraction allows arbitrary file write

CVSS 5.5 · Medium EPSS 0.25% · P49

Possible ATT&CK Techniques 1AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProductVersion RangeStatus
portainerportainer>= 2.33.0, < 2.33.8affected
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I. Basic Information for CVE-2026-44885

Vulnerability Information
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Vulnerability Title
Portainer: Path traversal in backup archive extraction allows arbitrary file write
Source: NVD (National Vulnerability Database)
Vulnerability Description
Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33.8, Portainer's backup restore feature accepts a .tar.gz archive and extracts it to a target directory on the server. The extraction function (ExtractTarGz in api/archive/targz.go) constructed output paths using filepath.Clean(filepath.Join(outputDirPath, header.Name)). This combination does not prevent directory traversal — a tar entry named ../../etc/cron.d/evil resolves to a path outside the extraction root, so a crafted archive can write files to arbitrary locations on the server filesystem. This vulnerability is fixed in 2.33.8.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Portainer 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Portainer是Portainer开源的一款用于管理Docker环境和Docker主机的轻量级用户管理界面。 Portainer Community Edition 2.33.0版本至2.33.8之前版本存在路径遍历漏洞，该漏洞源于备份恢复功能中tar.gz解压操作未正确防止路径遍历，允许写入任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
portainerportainer >= 2.33.0, < 2.33.8 -

II. Public POCs for CVE-2026-44885

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III. Intelligence Information for CVE-2026-44885

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Patches & Fixes for CVE-2026-44885 (1)

Vendor Advisories for CVE-2026-44885 (1)

Same Patch Batch · portainer · 2026-05-28 · 9 CVEs total

CVE-2026-448508.5 HIGHPortainer: Bind-mount restriction bypass via HostConfig.Mounts
CVE-2026-448828.1 HIGHPortainer: Kubernetes middleware continues after token validation failure, bypassing endpo
CVE-2026-33590Insecure default permissions in Portainer CE
CVE-2026-44881Portainer: Arbitrary File Read via Git Symlink Injection in Stack Auto-Update
CVE-2026-44884Portainer: Missing authorization on custom template file endpoint exposes template content
CVE-2026-44848Portainer: Missing authorization on Docker plugin endpoints allows host RCE
CVE-2026-44883Portainer: JWT accepted in URL query leaks tokens to logs and referers
CVE-2026-44849Portainer: Endpoint security bypass via Swarm service create/update

IV. Related Vulnerabilities

Same product: portainer
Same vendor: portainer
Same weakness: CWE-22

V. Comments for CVE-2026-44885

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