Unrated

Unauthenticated OIDC State Exhaustion in nebula-mesh

IdentifiersCVE-2026-55512CWE-770

CVE-2026-55512 is an unauthenticated resource-exhaustion vulnerability in nebula-mesh when OIDC is enabled. The Web UI OIDC login endpoint allocates server-side in-memory state entries for login attempts and does not adequately bound or rate limit creation of those entries. Repeated requests to the OIDC login route can therefore cause the application to accumulate large numbers of live OIDC state objects that remain resident for approximately 10 minutes. This permits remote memory growth and can degrade service availability.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated remote attacker to drive unbounded memory consumption in the nebula-mesh process by repeatedly invoking the OIDC login flow. As memory usage increases, the application may suffer performance degradation, instability, or denial of service, particularly on resource-constrained deployments or where repeated requests can be sustained over time.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, disable OIDC where it is not required. Restrict access to the Web UI, including the OIDC login route, using network segmentation, reverse-proxy access controls, or equivalent filtering. Apply external rate limiting specifically to the OIDC login endpoint to reduce the ability of unauthenticated clients to create excessive state entries.

Remediation

Patch, then assume compromise.

Upgrade nebula-mesh to version 0.5.0 or later. A complete fix should ensure the OIDC login endpoint is subject to authentication-related rate limiting, enforce per-client and/or global limits on concurrently retained OIDC state entries, fail closed when those limits are exceeded, and include regression testing to prevent reintroduction of the issue.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

No public activity tracked yet. Mallory keeps watching.

0 SOURCESView more in app

No public activity observed for this vulnerability.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity