How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is high, 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 none, integrity none, availability low.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
- 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: None.
- Integrity impact: None.
- Availability impact: Low — limited, and the attacker does not choose what is affected.
Weakness class
CVE-2026-40279 is classified as CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior. The product uses an API function, data structure, or other entity in a way that relies on properties that are not always guaranteed to hold for that entity.
Affected software
CVE-2026-40279 is recorded against 1 package.
- bacnet-stack (fixed in 1.4.3)
Timeline and source
Published on 21 April 2026 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.
References
github.com
github.com
Other advisories for this package
bacnet-stack has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior) in other software:
