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CVE-2026-31866— Allocation of Resources Without Limits or Throttling in flagd

Quick assessment

Affected
open-feature flagd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenFeature flagd是OpenFeature公司的一个守护进程。 flagd 0.14.2之前版本存在安全漏洞，该漏洞源于对请求负载中的评估上下文无大小限制，可能导致内存耗尽和进程终止。

CVSS 7.5 · High EPSS 0.44% · P38

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-31866

Vulnerability Information
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Vulnerability Title
Allocation of Resources Without Limits or Throttling in flagd
Source: CVE Program / CVE List V5
Vulnerability Description
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 accessible by client applications. The evaluation context included in request payloads is read into memory without any size restriction. An attacker can send a single HTTP request with an arbitrarily large body, causing flagd to allocate a corresponding amount of memory. This leads to immediate memory exhaustion and process termination (e.g., OOMKill in Kubernetes environments). flagd does not natively enforce authentication on its evaluation endpoints. While operators may deploy flagd behind an authenticating reverse proxy or similar infrastructure, the endpoints themselves impose no access control by default. This vulnerability is fixed in 0.14.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenFeature flagd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenFeature flagd是OpenFeature公司的一个守护进程。 flagd 0.14.2之前版本存在安全漏洞，该漏洞源于对请求负载中的评估上下文无大小限制，可能导致内存耗尽和进程终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-feature flagd < 0.14.2 -

II. Public POCs for CVE-2026-31866

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9139 chars
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III. Intelligence Information for CVE-2026-31866

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Patches & Fixes for CVE-2026-31866 (1)

Vendor Advisories for CVE-2026-31866 (1)

IV. Related Vulnerabilities

Same vendor: open-feature
Same weakness: CWE-770