🛡️ CVE-2023-0440 — healthchecks

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
• Integrity impact: None.
• Availability impact: None.

Weakness class

CVE-2023-0440 is classified as CWE-203: Observable Discrepancy. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

Affected software

CVE-2023-0440 is recorded against 1 package.

• healthchecks (fixed in 2.6)

Timeline and source

Published on 23 January 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
huntr.dev
github.com
huntr.dev

Same weakness in other software

These advisories are the same class of weakness (CWE-203: Observable Discrepancy) in other software:

• CVE-2026-58445 (2.7 Low, published 13 Aug 2026)
• CVE-2025-13736 (3.7 Low, published 6 Aug 2026)
• CVE-2026-59640 (published 3 Aug 2026)
• CVE-2026-67193 (5.3 Medium, published 29 Jul 2026)
• CVE-2026-55555 (7.5 High, published 28 Jul 2026)
• CVE-2026-64713 (8.1 High, published 27 Jul 2026)
• CVE-2025-54999 (2.0 Low, published 27 Jul 2026)
• CVE-2026-44332 (5.3 Medium, published 24 Jul 2026)

Details

Affected Packages

References