CVE-2026-55767

Guzzle is an extensible PHP HTTP client. Prior to 7.12.1, CookieJar incorrectly accepts cookies with a dot-only Domain attribute and whitespace-padded variants. SetCookie::matchesDomain removes leading dots from the cookie domain, normalizing dot-only values to the empty string; SetCookie::valida...

Dot-only cookie domains match all hosts

Impact CookieJar incorrectly accepts cookies with a dot-only Domain attribute, such as Domain=., Domain=.., Domain=..., and whitespace-padded variants such as Domain= . . In affected versions, SetCookie::matchesDomain removes leading dots from the cookie domain, normalizing dot-only values to the...

tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments

A flaw was found in Tornado. A remote attacker could exploit this vulnerability by injecting specially crafted characters into the domain, path, and samesite arguments when setting cookies. This could lead to cookie attribute injection, potentially allowing for information disclosure or...