CVE-2026-47122

Sparkle's AppInstaller post-stage-1 XPC listener accepts unvalidated connections, allowing spoofed appcast item data injection

State: Published
Severity: 4.2 Medium
Published: Jul 21, 2026
Updated: Jul 21, 2026
Reserved: May 18, 2026

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Description

Sparkle is a software update framework for macOS. In versions up to and including 2.9.1, `Autoupdate/AppInstaller.m`'s `shouldAcceptNewConnection:` only enforces `SUCodeSigningVerifier validateConnection:` before stage 1 completes. After `_performedStage1Installation = YES`, new connections to the registered Mach service `<bundleId>-spki` are accepted from any local process without team-ID or code-signing checks. As of time of publication, no known patched versions are available.

Scores

CVSS	Score	Vector	Source
3.1	4.2 Medium	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L	GitHub_M

Weaknesses

CWE-306 Missing Authentication for Critical Function
CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')

Affected Products

Product	Versions
Sparklesparkle-project	<= 2.9.1Affected

References

https://github.com/sparkle-project/Sparkle/security/advisories/GHSA-g3hp-f6mg-559v

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