What is CVE-2026-31866?

CVE-2026-31866 is a high-severity vulnerability in Open-feature Flagd, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-03-11.

How severe is CVE-2026-31866?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Open-feature Flagd

CVE-2026-31866

flagd is a feature flag daemon with a Unix philosophy. Prior to 0.14.2, flagd exposes OFREP (/ofrep/v1/evaluate/...) and gRPC (evaluation.v1, evaluation.v2) endpoints for feature flag evaluation. These endpoints are designed to be publicly…

EPSS: 0.001 (29.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Open-feature Flagd — versions < 0.14.2

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

https://github.com/open-feature/flagd/security/advisories/GHSA-rmrf-g9r3-73pm (x_refsource_CONFIRM)
https://github.com/open-feature/flagd/commit/25c5fd7e80c26eb2c00b20317b2456fe6f927ea3 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-31866?: CVE-2026-31866 is a high-severity vulnerability in Open-feature Flagd, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-03-11.
How severe is CVE-2026-31866?: High severity. CVSS v3 base score is 7.5 out of 10.