# CVE-2026-23517: GO-2026-4334 - Fleet has an Access Control vulnerability in debug/pprof endpoints in github.com/fleetdm/fleet

Source: https://junglewise.ai/threats/cve-2026-23517-fleet-has-an-access-control-vulnerability-in-debug-pprof  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-03  
License: CC BY 4.0 with a link back

CVE-2026-23517 · Severity: medium · CVSS 4 · Published 2026-02-03

Fleet has an Access Control vulnerability in debug/pprof endpoints in github.com/fleetdm/fleet

Technologies: [github.com/fleetdm/fleet (Go)](https://junglewise.ai/threats/technologies/github-com-fleetdm-fleet), [github.com/fleetdm/fleet/v4 (Go)](https://junglewise.ai/threats/technologies/github-com-fleetdm-fleet-v4). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-23517 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-23517 being exploited in the wild.

**How severe is CVE-2026-23517?** Medium severity, with a CVSS score of 4, published 3 February 2026.

**Which products and versions are affected?** github.com/fleetdm/fleet (Go) SEMVER:introduced=4.78.0,fixed=4.78.3; github.com/fleetdm/fleet/v4 (Go) SEMVER:introduced=0,fixed=4.78.3-0.20260112221730-5c030e32a3a9, SEMVER:introduced=4.75.0,fixed=4.75.2,introduced=4.76.0,fixed=4.76.2,introduced=4.77.0,fixed=4.77.1,introduced=4.78.0,fixed=4.78.3.

**Is there a fix for CVE-2026-23517?** Yes. github.com/fleetdm/fleet (Go): upgrade to 4.78.3 or later; github.com/fleetdm/fleet/v4 (Go): upgrade to 4.78.3, 4.78.3-0.20260112221730-5c030e32a3a9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-23517?** Check whether you run github.com/fleetdm/fleet (Go) or github.com/fleetdm/fleet/v4 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/fleetdm/fleet (Go): upgrade to 4.78.3 or later

  ```sh
  go get github.com/fleetdm/fleet@v4.78.3
  ```

- github.com/fleetdm/fleet/v4 (Go): upgrade to 4.78.3, 4.78.3-0.20260112221730-5c030e32a3a9 or later

  ```sh
  go get github.com/fleetdm/fleet/v4@v4.78.3-0.20260112221730-5c030e32a3a9
  ```


## Affected products

- github.com/fleetdm/fleet (Go) SEMVER:introduced=4.78.0,fixed=4.78.3
- github.com/fleetdm/fleet/v4 (Go) SEMVER:introduced=0,fixed=4.78.3-0.20260112221730-5c030e32a3a9, SEMVER:introduced=4.75.0,fixed=4.75.2,introduced=4.76.0,fixed=4.76.2,introduced=4.77.0,fixed=4.77.1,introduced=4.78.0,fixed=4.78.3

## Identifiers

- CVE-2026-23517
- GHSA-4r5r-ccr6-q6f6
- GO-2026-4334

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