Vinchin Backup & Recovery agentlink_server Stack Buffer Overflow Vulnerability
Vinchin Backup & Recovery through 9.0.0.86562 contains a stack buffer overflow vulnerability in the ModuleHandShake function of the agentlink_server service that allows unauthenticated remote attackers to overwrite the saved return address by supplying an oversized _listen_uuid field that is measured via strlen() and copied without bounds checking into a fixed-length stack buffer using strcpy(). Attackers can send a crafted request with a malicious _listen_uuid value to corrupt the stack and achieve process crash or potential control flow hijack without requiring authentication.
Browse Memory Corruption security risksQuick answer
Vinchin Backup & Recovery should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Vinchin Backup & Recovery through 9.0.0.86562
Fixed versions
- Apply the latest vendor-supported patched release
How to fix it
Vinchin Backup & Recovery through 9.0.0.86562 is affected by a stack buffer overflow in agentlink_server. Apply the latest vendor-supported patched release and restrict agent communication ports. Backup infrastructure holds high-value credentials and data paths, so review logs for unauthenticated network attempts.
- Inventory Vinchin Backup & Recovery servers, agents, and versions through 9.0.0.86562.
- Upgrade to the latest vendor-supported patched release.
- Restrict agentlink_server and backup agent communication to trusted backup networks only.
- Block unauthenticated access to backup services from user, internet, or untrusted segments.
- Review agentlink_server logs, crash reports, and network telemetry for oversized _listen_uuid values.
- Rotate backup administrator credentials and agent secrets if exploitation is suspected.
- Validate backup repository integrity and restore points after remediation.
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Verify the fix
- Confirm Vinchin Backup & Recovery is upgraded beyond the affected build.
- Validate malformed handshake requests no longer crash or corrupt agentlink_server.
- Review logs for unauthenticated exploit attempts and process crashes.
- Test backup, replication, restore, and agent registration workflows after the upgrade.
- Run a Fixnx scan and confirm backup management services are not publicly exposed.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-60095?
Vinchin Backup & Recovery versions listed as affected should be reviewed: Vinchin Backup & Recovery through 9.0.0.86562.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.