Interpretation Conflict

Overview Affected versions of this package are vulnerable to Interpretation Conflict via the assertValidHost function. An attacker can cause security or routing decisions to be made based on a mismatched host by crafting a URI with authority delimiters, embedded ports, or malformed IPv6 brackets...

CVE-2026-59882: Interpretation Conflict

guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.3, Uri::assertValidHost does not reject URI host components containing authority delimiters, embedded ports, or malformed IPv6 brackets, allowing Uri::getHost to disagree with the URI authority used for security ...