CVE-2026-110713 sahlberg CVE debrief

Who should care

Defenders responsible for systems using libsmb2, particularly those with SMB connectivity, should assess exposure and prioritize verification and updates. Defenders should care about CVE-2026-110713 because it affects libsmb2, potentially allowing malicious SMB servers to crash clients or access sensitive data. Verification of libsmb2 versions, monitoring of SMB activity, and implementation of compensating controls are crucial.

Why it matters

Defenders should care about CVE-2026-110713 because it affects libsmb2, potentially allowing malicious SMB servers to crash clients or access sensitive data. Verification of libsmb2 versions, monitoring of SMB activity, and implementation of compensating controls are crucial.

• Potential client crashes due to out-of-bounds reads
• Possible data exposure through crafted SMB replies
• Need for verification of libsmb2 versions and updates
• Importance of monitoring SMB activity for suspicious behavior

Technical summary

The libsmb2 library through version 6.2 contains a heap out-of-bounds read vulnerability in the smb2_decode_file_fs_volume_info and smb2_decode_file_fs_attribute_info functions. This vulnerability allows malicious SMB servers to read past reply buffers by sending crafted QUERY_INFO replies with missing or oversized name lengths, potentially crashing the client. The vulnerability affects libsmb2, potentially allowing malicious SMB servers to crash clients or access sensitive data. Verification of libsmb2 versions, monitoring of SMB activity, and implementation of compensating controls are crucial. No additional information is available on the exploitability of this vulnerability.

Defensive priority

Defenders should prioritize verifying and updating libsmb2 versions, monitoring for suspicious SMB activity, and implementing compensating controls.

Recommended defensive actions

• Verify and update libsmb2 versions to 6.3 or later
• Monitor for suspicious SMB activity
• Implement compensating controls
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and potential attack vectors. The vulnerability is caused by a heap out-of-bounds read in the smb2_decode_file_fs_volume_info and smb2_decode_file_fs_attribute_info functions. The CVE record was published on 2026-10-14T15:01:28.343Z and has not been modified since then. No additional information is available on the exploitability of this vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.