CVE-2026-48025: CWE-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection') in juev nebula-mesh
nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.7, internal/pki/resolver.go:36-64 constructs a CAManager with the plaintext ed25519.PrivateKey after unwrapping via the master key; internal/pki/ca.go:13-16 stores it. Callers at internal/api/enroll.go:116, internal/api/updates.go:297, and internal/api/mobile_bundle.go:40 use the manager for one Sign() and drop the reference on function return — but the underlying slice contents are not wiped before release. The keystore package's contract (internal/keystore/keystore.go doc: "Callers MUST zeroise the returned plaintext DEK as soon as it is no longer needed") is not met by the CAManager consumer. Decrypted CA private keys persist in process heap until Go's GC scavenges the underlying slice — minutes to hours under load, indefinitely on idle servers. This issue has been patched in version 0.3.7.
AI Analysis
Technical Summary
The vulnerability in nebula-mesh (CVE-2026-48025) involves the failure to zeroize decrypted CA private keys in memory after signing operations. Specifically, the plaintext private key remains in the process heap because it is not cleared before the memory is released, persisting until garbage collection occurs. This exposure allows local attackers with memory-read capabilities to potentially disclose sensitive private key material. The issue affects versions prior to 0.3.7 and undermines the intended security model of the master-key envelope encryption. Remote exploitation is not possible.
Potential Impact
Decrypted CA private keys may be exposed in process memory after signing operations, risking local memory disclosure attacks. This compromises the confidentiality of the CA private key and weakens the security guarantees of the master-key envelope encryption design. There is no indication of remote exploitability, limiting the impact to local attackers with memory access.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict local access to systems running affected versions to trusted users only to reduce risk of memory disclosure. Monitor vendor channels for updates addressing this vulnerability.
CVE-2026-48025: CWE-244: Improper Clearing of Heap Memory Before Release ('Heap Inspection') in juev nebula-mesh
Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.7, internal/pki/resolver.go:36-64 constructs a CAManager with the plaintext ed25519.PrivateKey after unwrapping via the master key; internal/pki/ca.go:13-16 stores it. Callers at internal/api/enroll.go:116, internal/api/updates.go:297, and internal/api/mobile_bundle.go:40 use the manager for one Sign() and drop the reference on function return — but the underlying slice contents are not wiped before release. The keystore package's contract (internal/keystore/keystore.go doc: "Callers MUST zeroise the returned plaintext DEK as soon as it is no longer needed") is not met by the CAManager consumer. Decrypted CA private keys persist in process heap until Go's GC scavenges the underlying slice — minutes to hours under load, indefinitely on idle servers. This issue has been patched in version 0.3.7.
CVSS v4.0
Score 6.9medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in nebula-mesh (CVE-2026-48025) involves the failure to zeroize decrypted CA private keys in memory after signing operations. Specifically, the plaintext private key remains in the process heap because it is not cleared before the memory is released, persisting until garbage collection occurs. This exposure allows local attackers with memory-read capabilities to potentially disclose sensitive private key material. The issue affects versions prior to 0.3.7 and undermines the intended security model of the master-key envelope encryption. Remote exploitation is not possible.
Potential Impact
Decrypted CA private keys may be exposed in process memory after signing operations, risking local memory disclosure attacks. This compromises the confidentiality of the CA private key and weakens the security guarantees of the master-key envelope encryption design. There is no indication of remote exploitability, limiting the impact to local attackers with memory access.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict local access to systems running affected versions to trusted users only to reduce risk of memory disclosure. Monitor vendor channels for updates addressing this vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-8h84-fhqq-q58v
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-48025"]
- Ecosystems
- ["Go"]
- Database Specific Severity
- MODERATE
- Cvss Version
- null
Threat ID: 6a3ef76827e9c79719fee7bb
Added to database: 06/26/2026, 22:04:24 UTC
Last enriched: 07/29/2026, 21:02:27 UTC
Last updated: 07/31/2026, 21:27:07 UTC
Views: 16
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