---
title: "CVE-2026-44849: Portainer has an endpoint security bypass via Swarm service create/update"
url: https://erroneo.us/security/cve/CVE-2026-44849/
description: "CVE-2026-44849 (github.com/portainer/portainer (Go)): Portainer Community Edition is a lightweight service delivery platform for containerized applications…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-28
date_modified: 2026-06-09
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-44849"
kev: false
cvss: 9.4
epss: 0.00446
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-44849: Portainer has an endpoint security bypass via Swarm service create/update

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 38: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 38% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes github.com/portainer/portainer (Go) >= 2.33.0, < 2.33.8, fixed in 2.33.8 ; github.com/portainer/portainer (Go) >= 2.39.0, < 2.39.2, fixed in 2.39.2 ; github.com/portainer/portainer (Go) >= 2.40.0, < 2.41.0, fixed in 2.41.0 . Check your lockfile, including transitive dependencies.

## What it is

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, 2.39.2, and 2.41.0, Portainer enforces seven EndpointSecuritySettings restrictions that administrators configure to restrict the container configurations non-admin users can launch: privileged mode, host PID namespace, device mapping, capabilities, sysctls, security-opt (Seccomp / AppArmor), and bind mounts. These restrictions are enforced on the standard container creation path, but several of them are not applied on the Docker Swarm service API. This vulnerability is fixed in 2.33.8, 2.39.2, and 2.41.0.

## Affected packages

- Go `github.com/portainer/portainer` >= 2.33.0, < 2.33.8 → fixed: 2.33.8
- Go `github.com/portainer/portainer` >= 2.39.0, < 2.39.2 → fixed: 2.39.2
- Go `github.com/portainer/portainer` >= 2.40.0, < 2.41.0 → fixed: 2.41.0

## Affected products (CVE record)

- portainer portainer: >= 2.33.0, < 2.33.8, >= 2.39.0, < 2.39.2, >= 2.40.0, < 2.41.0

## Severity

- GitHub_M CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`
- GitHub CVSS 4.0: 9.4 `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.45% probability of exploitation activity in the next 30 days; percentile 38.

## Sources

- [GitHub Advisory GHSA-5fxq-qcf3-244w](https://github.com/advisories/GHSA-5fxq-qcf3-244w)
- [CVE.org record CVE-2026-44849](https://www.cve.org/CVERecord?id=CVE-2026-44849)
- [NVD entry CVE-2026-44849](https://nvd.nist.gov/vuln/detail/CVE-2026-44849)
- [github.com](https://github.com/portainer/portainer/security/advisories/GHSA-5fxq-qcf3-244w)
- [github.com](https://github.com/portainer/portainer/releases/tag/2.33.8)
- [github.com](https://github.com/portainer/portainer/releases/tag/2.39.2)
- [github.com](https://github.com/portainer/portainer/releases/tag/2.41.0)

---
Source page: https://erroneo.us/security/cve/CVE-2026-44849/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt