CVE-2026-21057 Samsung Mobile CVE debrief

Who should care

Users of Samsung Pass, particularly those using versions prior to 5.2.10.3, should verify their version and update to the latest version to mitigate this vulnerability. This includes individuals and organizations using Samsung devices for authentication purposes. Security teams and vulnerability management teams should also be aware of this vulnerability and take necessary steps to ensure that affected systems are updated or mitigated.

Technical summary

The vulnerability is caused by improper input validation in Samsung Pass prior to version 5.2.10.3. This allows local privileged attackers to write out-of-bounds memory, potentially leading to unauthorized access to sensitive information. The CVSS score for this vulnerability is 6.8, and the severity is MEDIUM. To mitigate this vulnerability, users should update to version 5.2.10.3 or later. Additionally, implementing input validation and memory protection mechanisms can help prevent similar attacks in the future.

Defensive priority

Medium priority

Recommended defensive actions

• Verify Samsung Pass version and update to 5.2.10.3 or later
• Implement input validation and memory protection mechanisms
• Monitor system logs for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. However, the source detail is limited, and further verification is needed to confirm the affected scope and vendor remediation. The vulnerability is classified as MEDIUM severity, and users should update to version 5.2.10.3 or later to mitigate this vulnerability. Additional verification tasks include reviewing system logs for suspicious activity and implementing input validation and memory protection mechanisms.

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.