nebula-mesh: Operator session tokens stored in plaintext in the database (CVE-2026-53603) | HOL Guard CVE

High · CVSS 7.1CVE-2026-53603GHSA-Q4VM-PQ3Q-8WGQ

nebula-mesh: Operator session tokens stored in plaintext in the database

Answer in brief

CVE-2026-53603 records a High severity (CVSS 7.1) vulnerability in nebula-mesh: Operator session tokens stored in plaintext in the database. The current sources do not mark it as known exploited. The current feed maps forgekeep/nebula-mesh (generic), github.com/forgekeep/nebula-mesh (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 4, 2026Updated Sep 8, 2026Source checked Sep 17, 2026First seen by HOL Jul 15, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps forgekeep/nebula-mesh (generic), github.com/forgekeep/nebula-mesh (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
forgekeep/nebula-meshgeneric	< 0.3.8	Not reported
github.com/forgekeep/nebula-meshgo	<=0.3.7	0.3.8

Recommended response

Check inventory. Check lockfiles and deployed manifests for forgekeep/nebula-mesh, github.com/forgekeep/nebula-mesh.
Review the reported fix. Update github.com/forgekeep/nebula-mesh to 0.3.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 15, 2026

Sources and claim methodology

Upstream source description

nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, Operator session tokens are stored in plaintext in the operator_sessions table (the token column is the PRIMARY KEY). The session token is a 32-byte random hex value sent directly in a cookie and valid for 24 hours. Anyone who can read the database (backup, snapshot, file copy, or SQL-level disclosure) obtains every active session token and can hijack operator sessions directly, with no further authentication. This issue has been patched in version 0.3.8.

Quoted source text, attributed separately from HOL analysis.