CVE-2026-56254 Details
Description
In @capgo/capacitor-updater (Cap-go/capgo) before 12.128.2, the end-to-end encryption scheme distributes the private key to each device that downloads the app. Because the public key can be derived from the private key, an attacker performing a man-in-the-middle attack or compromising the Capgo server can create a validly signed update bundle and cause devices to install an update not produced by the original app maker.
A vulnerability exists in the @capgo/capacitor-updater package, specifically in versions prior to 12.128.2. The issue arises from the end-to-end encryption scheme, which improperly distributes the private key to each device that downloads the app. Since the public key can be derived from the private key, this flaw allows an attacker to perform a man-in-the-middle attack or compromise the Capgo server to create a validly signed update bundle. Consequently, devices may install an update not authorized by the original app developer.
Users are advised to upgrade to version 12.128.2 or later. For those unable to upgrade, consider implementing a key management system that prevents the public key from being derived from the private key.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 10, 2026CISA-ADP
Assessed Jul 10, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-320 | Key Management Errors | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Cap-go/capgo | < 12.128.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 10, 2026 | CVE Modified | CISA-ADP |
| Jul 10, 2026 | New CVE Received | [email protected] |