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Versions of the package tough-cookie before 4.1.3 are vulnerable to Prototype Pollution due to improper handling of Cookies when using CookieJar in rejectPublicSuffixes=false mode. This issue arises from the manner in which the objects are initialized.

🗓️ 03 Sep 2025 21:34:38Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 6 Views

Tough-Cookie versions before 4.1.3 are vulnerable to Prototype Pollution via CookieJar in rejectPublicSuffixes=false mode.

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03 Sep 2025 21:34Current
7High risk
Vulners AI Score7
CVSS 3.16.5 - 9.8
EPSS0.06248
SSVC
prototype pollutiontough cookiecookie jarreject public suffixescookie initializationvulnerability version 4.1.3
6