Quick answers
- Is CVE-2026-56719 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-56719 being exploited in the wild.
- How severe is CVE-2026-56719?
- Medium severity, with a CVSS score of 6.5, published 16 September 2026.
- Which products and versions are affected?
- MikroTik RouterOS before 7.24; specifically 6.49.18 and earlier, 7.0.0–7.23.x.
- Is there a fix for CVE-2026-56719?
- A patch was published on 2026-08-14: Fix included in RouterOS 7.24 stable release Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-56719 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-56719?
- Check whether you run MikroTik RouterOS 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
The vulnerability is an out-of-bounds read (CWE-125) in the userspace SMB daemon's SessionSetupAndX handler. An attacker can craft a minimal SMB1 SessionSetupAndX frame with a malicious uniPwdLen field value to trigger a read beyond the end of the request buffer. The flaw occurs before credential validation, meaning no SMB authentication is required. A network-based attacker can read arbitrary memory contents, potentially exposing sensitive data from the router process. The vulnerability is fixed in RouterOS 7.24 and later; affected versions include 6.49.18 and earlier, and 7.0.0 through 7.23.x.
Affected products
- MikroTik RouterOS before 7.24; specifically 6.49.18 and earlier, 7.0.0–7.23.x
Timeline
- 2026-09-16: disclosed: CVE-2026-56719 disclosed
- 2026-08-14: patched: Fix included in RouterOS 7.24 stable release