Vinchin Backup & Recovery agentlink_server Heap Buffer Overflow Vulnerability
Vinchin Backup & Recovery through 9.0.0.86562 contains a heap buffer overflow vulnerability that allows unauthenticated remote attackers to cause process crash or memory corruption by sending a malformed TCP packet with an unchecked body_len field to the agentlink_server service. Attackers can craft a malicious packet that passes an attacker-controlled length directly to recv(), triggering a heap overflow of up to approximately 4 GiB and resulting in process crash or potential memory corruption.
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 heap buffer overflow in agentlink_server through unchecked body_len handling. Upgrade to a patched vendor release and limit network access to backup services. Treat crashes or malformed packet activity as potential compromise indicators for backup infrastructure.
- Inventory Vinchin Backup & Recovery servers and agents running through 9.0.0.86562.
- Upgrade affected systems to the latest vendor-supported patched release.
- Restrict agentlink_server communication to trusted backup subnets and approved agents.
- Block external or user-network access to backup agent ports.
- Review crash logs and packet captures for malformed TCP packets with abnormal body_len values.
- Rotate backup credentials, agent secrets, and repository access keys if suspicious activity is found.
- Verify backup repository integrity before resuming normal operations.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm affected Vinchin components are upgraded beyond the vulnerable build.
- Validate malformed packets no longer crash agentlink_server in a safe test environment.
- Review service uptime and logs for heap corruption or repeated crashes.
- Test backup, restore, and agent connectivity after patching.
- Run a Fixnx scan and confirm backup administration services are not public.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-60094?
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.