CVE-2026-55512Public exploitNetwork attack vector

Service degradation via unbounded OIDC state allocation

Published Sep 4, 2026 · Updated Sep 9, 2026

Uncontrolled resource consumption in Forgekeep nebula-mesh 0.2.0 through 0.4.x allows remote attackers to degrade service via OIDC login requests. HandleLogin creates a fresh random state for every request, and rememberState retains each entry for ten minutes without a rate limit or live-state cap. OIDC must be enabled, but no credentials, identity-provider callback, or user interaction is required to cause application memory growth.

CVSS severity5.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Forgekeep nebula-mesh 0.2.0 through 0.4.x allows remote attackers to degrade service via OIDC login requests. HandleLogin creates a fresh random state for every request, and rememberState retains each entry for ten minutes without a rate limit or live-state cap. OIDC must be enabled, but no credentials, identity-provider callback, or user interaction is required to cause application memory growth.

The record

CVE
CVE-2026-55512
Published
Sep 4, 2026
Updated
Sep 9, 2026
Vendor
Forgekeep
Product
nebula-mesh
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.2.0, < 0.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Forgekeep · nebula-meshversion=>= 0.2.0, < 0.5.0

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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