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CVE-2026-44885

Portainer: Path traversal in backup archive extraction allows arbitrary file write

Published: May 28, 2026Updated: Jun 1, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
5.5CVSSMEDIUM
EPSS Score
0.6%
Top 57.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:NI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:LAvailability
Low
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Weaknesses

CWE-22

Affected Products

portainerportainer
On-prem
Cloud & SaaS / container-orchestration
portaineross-projectCloud & SaaS

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/portainer/portainer/security/advisories/GHSA-m8fg-67j7-cx4v
github.com
https://github.com/portainer/portainer-suite/pull/1875
github.com

Timeline

Published
May 28, 2026
Last Updated
Jun 1, 2026

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