Memory Exhaustion Vulnerability in flagd by Open Feature
CVE-2026-31866

7.5HIGH

Key Information:

Vendor

Open-feature

Status
Flagd
Vendor
CVE Published:
11 March 2026

What is CVE-2026-31866?

The flagd feature flag daemon prior to version 0.14.2 contains a vulnerability that allows for memory exhaustion due to the unrestricted size of request payloads sent to its publicly accessible evaluation endpoints. This oversight enables an attacker to craft a malicious HTTP request with a large body, leading to a significant allocation of memory and potentially resulting in the termination of the flagd process. While it is recommended to deploy flagd behind an authenticating reverse proxy to mitigate risks, the default lack of access control on these endpoints poses a serious security threat. The issue has been addressed in version 0.14.2.

Affected Version(s)

flagd < 0.14.2

References

https://github.com/open-feature/flagd/security/advisories...
x_refsource_CONFIRM
https://github.com/open-feature/flagd/commit/25c5fd7e80c2...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.