Sparkle's AppInstaller post-stage-1 XPC listener accepts unvalidated connections, allowing spoofed appcast item data injection
AppInstaller post-stage-1 XPC listener accepts unvalidated connections, allowing spoofed appcast item data injection.
Advisories for Swift/Github.com/Sparkle-Project/Sparkle package
2026
Sparkle: Binary delta apply intermediate-symlink traversal in malicious .delta
Binary delta apply intermediate-symlink traversal in malicious .delta Autoupdate/SUBinaryDeltaApply.m enforces relativePath.pathComponents containsObject:@".." and rejects writes whose immediate parent directory IS itself a symbolic link, but does not detect symlinks deeper in the relative path. Autoupdate/SPUSparkleDeltaArchive.m's extractItem: will create symlinks in the destination tree from archive content (no .. check on the symlink target), and a subsequent Extract item targeting <symlink>/foo/bar then escapes the destination tree via fopen(path, "wb") because the …
2025
Sparkle Signing Checks Bypass
A security issue was found in Sparkle before version 2.6.4. An attacker can replace an existing signed update with another payload, bypassing Sparkle’s (Ed)DSA signing checks.