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GHSA-rmrf-g9r3-73pm

HighCVSS 7.5 / 10
Published Mar 11, 2026·Last modified Mar 23, 2026
Affected Components(0)

No affected components available

Description

Details

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.

Impact

  • Denial of Service: A single crafted request can crash the flagd process.
  • Service Disruption: All applications relying on the affected flagd instance for feature flag evaluation will lose access to flag evaluations until the process restarts.
  • Repeated Exploitation: An attacker can continuously send oversized requests to prevent recovery.

Affected Endpoints

  • /ofrep/v1/evaluate/flags/{flagKey} (OFREP single flag evaluation)
  • /ofrep/v1/evaluate/flags (OFREP bulk evaluation)
  • flagd.evaluation.v1.Service/ResolveBoolean (gRPC/Connect)
  • flagd.evaluation.v1.Service/ResolveString (gRPC/Connect)
  • flagd.evaluation.v1.Service/ResolveFloat (gRPC/Connect)
  • flagd.evaluation.v1.Service/ResolveInt (gRPC/Connect)
  • flagd.evaluation.v1.Service/ResolveObject (gRPC/Connect)
  • flagd.evaluation.v1.Service/ResolveAll (gRPC/Connect)
  • flagd.evaluation.v2.Service/ResolveBoolean (gRPC/Connect)
  • flagd.evaluation.v2.Service/ResolveString (gRPC/Connect)
  • flagd.evaluation.v2.Service/ResolveFloat (gRPC/Connect)
  • flagd.evaluation.v2.Service/ResolveInt (gRPC/Connect)
  • flagd.evaluation.v2.Service/ResolveObject (gRPC/Connect)
Risk Scores
Base Score
7.5

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.

Threat Intelligence
6.9

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.42%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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