ByteOS Network

NVD Vulnerability Details :

CVE-2026-41431

Received

Source-security-advisories@github.com

Published At-11 May, 2026 | 18:16

Updated At-11 May, 2026 | 19:16

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	8.0	HIGH	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Type: Secondary

Version: 3.1

Base score: 8.0

Base severity: HIGH

Vector:

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE ID	Type	Source
CWE-347	Secondary	security-advisories@github.com

CWE ID: CWE-347

Type: Secondary

Source: security-advisories@github.com

References

Hyperlink	Source	Resource
https://github.com/zen-browser/desktop/commit/270db6d6713d2c6c14d9df0b4bc7662843d3d54e	security-advisories@github.com	N/A
https://github.com/zen-browser/desktop/security/advisories/GHSA-qpj9-m8jc-mw6q	security-advisories@github.com	N/A
https://github.com/zen-browser/desktop/security/advisories/GHSA-qpj9-m8jc-mw6q	134c704f-9b21-4f2e-91b3-4a467353bcc0	N/A