CVE-2025-8037 Affecting firefox-esr package, versions <140.1-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.22% (13th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-FIREFOXESR-17765007
  • published1 Jul 2026
  • disclosed22 Jul 2025

Introduced: 22 Jul 2025

CVE-2025-8037  (opens in a new tab)

How to fix?

Upgrade Chainguard firefox-esr to version 140.1-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the Secure attribute. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

CVSS Base Scores

version 3.1