CVE-2026-86315 Samsung Opensource CVE debrief

Who should care

Defenders responsible for maintaining and securing systems that use Samsung Open Source Escargot on Linux x86-64 should assess exposure and prioritize verification and potential updates.

Why it matters

CVE-2026-86315 is a medium-severity vulnerability in Samsung Open Source Escargot on Linux x86-64 that can lead to a denial-of-service condition and potential native memory corruption. Defenders should prioritize verifying the Escargot version and assessing exposure.

• Denial-of-service condition due to host process crash
• Potential for native memory corruption
• Need for verification of Escargot version and exposure

Technical summary

The vulnerability is caused by an out-of-bounds write due to numeric truncation in the Escargot JavaScript engine. An attacker who can supply JavaScript for execution can corrupt native memory and crash the host process via a crafted class definition with an instance initialization entry count that exceeds UINT16_MAX. This issue affects Escargot version 5dc93606abd42b859045add05d704a038e197359. Defenders should prioritize verifying the Escargot version and assessing exposure, as this vulnerability can lead to a denial-of-service condition and potential native memory corruption. The issue is triggered when an attacker supplies a crafted class definition with an instance initialization entry count that exceeds UINT16_MAX, which can be used to crash the host process and potentially corrupt native memory. To mitigate this vulnerability, defenders should verify the Escargot version and assess exposure to ensure that systems are not vulnerable to this issue. Additionally, defenders should review and update Escargot to a secure version if necessary and monitor for potential denial-of-service conditions. The vulnerability has a medium severity and can be exploited by an attacker who can supply JavaScript for execution. The Escargot JavaScript engine is used in Samsung Open Source Escargot on Linux x86-64, and the vulnerability can be triggered by a crafted class definition. The issue has been publicly disclosed and defenders should take steps to verify and mitigate the vulnerability. The vulnerability is a result of an out-of-bounds write due to numeric truncation, which can be used to corrupt native memory and crash the host process. To prevent exploitation, defenders should prioritize verifying the Escargot version and assessing exposure. The vulnerability affects Escargot version 5dc93606abd42b859045add05d704a038e197359, and defenders should review and update Escargot to a secure version if necessary. The issue is a medium-severity vulnerability that can lead to a denial-of-service condition and potential native memory corruption. Defenders should take steps to verify and mitigate the vulnerability to prevent exploitation. The vulnerability has been publicly The CVE

Defensive priority

Defenders should prioritize verifying the Escargot version and assessing exposure, as this vulnerability can lead to a denial-of-service condition.

Recommended defensive actions

• Verify Escargot version and assess exposure
• Review and update Escargot to a secure version if necessary
• Monitor for potential denial-of-service conditions
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability is caused by an out-of-bounds write due to numeric truncation in the Escargot JavaScript engine. The issue is triggered when an attacker supplies a crafted class definition with an instance initialization entry count that exceeds UINT16_MAX.

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.