Quick answers
- Is CVE-2026-85877 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-85877 being exploited in the wild.
- How severe is CVE-2026-85877?
- High severity, with a CVSS score of 8.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft Windows Print Spooler <UNKNOWN>.
- Is there a fix for CVE-2026-85877?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-85877 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-85877?
- Check whether you run Microsoft Windows Print Spooler or Microsoft Windows 11 24h2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A heap-based buffer overflow exists in Windows Print Spooler components, triggered by improper bounds checking on attacker-controlled input. The vulnerability is reachable over the network without authentication, allowing remote code execution with the privileges of the spooler service (typically SYSTEM). An attacker can craft a malicious network request to overflow a heap buffer and hijack execution flow. Patches are available from Microsoft; apply security updates immediately.
Affected products
- Microsoft Windows Print Spooler <UNKNOWN>
Timeline
- 2026-09-08: disclosed