CVE-2026-41431
HighSummary
Zen Browser prior to version 1.19.9b included a MAR updater that did not verify cryptographic signatures. This creates a risk of delivering unauthorized code to users via the auto-update mechanism.
Risk Assessment
The organization may be exposed to malware if the update server or GitHub release pipeline is compromised. Users could receive unsigned code, jeopardizing the security of their data.
Recommendation
It is recommended to update to version 1.19.9b or later to restore cryptographic signature verification and protect users from potential attacks.
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Original NVD description (English source)
Zen is a firefox-based browser. Prior to 1.19.9b, Zen Browser ships a Mozilla Application Resource (MAR) updater (org.mozilla.updater) that has had all MAR signature verification stripped from the Firefox codebase it was forked from. The MAR files served to users contain zero cryptographic signatures, and the updater binary contains zero cryptographic verification code. This eliminates the defense-in-depth that MAR signing provides. If the update server or GitHub release pipeline is compromised, arbitrary unsigned code can be delivered to all Zen users via the auto-update mechanism. This vulnerability is fixed in 1.19.9b.