PatchTheCVECVE-2026-23996: FastAPI Api Key provides a backend-agnostic library that provides an API key system
CVE-2026-23996 is a low-severity flaw (CVSS 3.7) affecting fastapi api key. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
FastAPI Api Key provides a backend-agnostic library that provides an API key system. Version 1.1.0 has a timing side-channel vulnerability in verify_key(). The method applied a random delay only on verification failures, allowing an attacker to statistically distinguish valid from invalid API keys by measuring response latencies. With enough repeated requests, an adversary could infer whether a key_id corresponds to a valid key, potentially accel
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 3.7 (Low) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 78%) |
| CISA exploited list | No |
| Weakness | CWE-208 |
| Published | 2026-01-21 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2026-23996?
fastapi api key: upgrade to 1.1.0. Exact commands for each OS are on this page.
Is CVE-2026-23996 being exploited?
CVE-2026-23996 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-2026-23996 affect?
CVE-2026-23996 affects fastapi api key. Severity is low (CVSS 3.7). FastAPI Api Key provides a backend-agnostic library that provides an API key system. Version 1.1.0 has a timing side-channel vulnerability in verify_key(). The method applied a random delay only on verification failures, allowing an attacke
How urgent is CVE-2026-23996?
Priority 23/100. Remotely exploitable, no login, no user action