CVE-2025-54376: Hoverfly is an open source API simulation tool

Q: How do I fix CVE-2025-54376?

hoverfly: upgrade to 1.12.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-54376 being exploited?

CVE-2025-54376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-54376 affect?

CVE-2025-54376 affects hoverfly. Severity is high (CVSS 7.5). Hoverfly is an open source API simulation tool. In versions 1.11.3 and prior, Hoverfly’s admin WebSocket endpoint /api/v2/ws/logs is not protected by the same authentication middleware that guards the REST admin API. Consequently, an unauth

Q: How urgent is CVE-2025-54376?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2025-54376 is a high-severity flaw (CVSS 7.5) affecting hoverfly. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hoverfly is an open source API simulation tool. In versions 1.11.3 and prior, Hoverfly’s admin WebSocket endpoint /api/v2/ws/logs is not protected by the same authentication middleware that guards the REST admin API. Consequently, an unauthenticated remote attacker can stream real-time application logs (information disclosure) and/or gain insight into internal file paths, request/response bodies, and other potentially sensitive data emitted in lo

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-200, CWE-287, CWE-532
Published	2025-09-10
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: hoverfly

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-09-10 20:15 UTCPublished CVE record published
2026-06-17 09:39 UTCUpdated Record last modified

hoverfly hoverfly UPGRADE

Affected: < 1.12.0

Fixed in: 1.12.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hoverfly || rpm -q hoverfly || hoverfly --version

2. UPGRADE to 1.12.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hoverfly

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hoverfly

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-54376?

hoverfly: upgrade to 1.12.0. Exact commands for each OS are on this page.

Is CVE-2025-54376 being exploited?

CVE-2025-54376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-54376 affect?

CVE-2025-54376 affects hoverfly. Severity is high (CVSS 7.5). Hoverfly is an open source API simulation tool. In versions 1.11.3 and prior, Hoverfly’s admin WebSocket endpoint /api/v2/ws/logs is not protected by the same authentication middleware that guards the REST admin API. Consequently, an unauth

How urgent is CVE-2025-54376?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-54123 CRITICAL 9.8 UPGRADE Hoverfly is an open source API simulation tool
CVE-2024-45388 HIGH 7.5 UPGRADE Hoverfly is a lightweight service virtualization/ API simulation / API mocking tool for developers and testers

References

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