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. A user must be tricked into taking some action. 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:R/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: Required — someone has to click, open or visit something.
- 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-2025-4656 is classified as CWE-1088: Synchronous Access of Remote Resource without Timeout. The code has a synchronous call to a remote resource, but there is no timeout for the call, or the timeout is set to infinite.
Affected software
CVE-2025-4656 is recorded against 2 packages.
- github.com/hashicorp/vault
- vault
Timeline and source
Published on 28 July 2025 and last revised on 4 February 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.
References
github.com (Advisory)
nvd.nist.gov (Advisory)
github.com (Fix)
discuss.hashicorp.com (Web)
Other advisories for this package
github.com/hashicorp/vault 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-1088: Synchronous Access of Remote Resource without Timeout) in other software:
