Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, SetCookie::matchesDomain() gives every subdomain of a cookie Domain that cookie unless SetCookie::matchesDomain() recognizes the Domain as an IP literal or a numeric host, and the decision comes from the domain's own text, so two spellings a transport reads as an address keep subdomain scope. Hexadecimal and mixed-base forms such as 0x7f000001 and 0177.0.0.0x1 go unrecognized while libcurl 8.21.0 reads both as 127.0.0.1. A percent-escaped Domain keeps that scope on both branches because percent-decoding sits above numeric parsing, so 192.168.0.%31 and 127.0.0.1%2e are registered names in the URI grammar rather than address literals, and no numeric rule in any base classifies them, while libcurl decodes the host before resolving and reads them as 192.168.0.1 and 127.0.0.1. A cookie stored for Domain=0x7f000001 is placed in the Cookie header of a request to evil.0x7f000001, disclosing a session identifier or token to a host that is not that address, and a response from evil.0x7f000001 setting Domain=0x7f000001 is accepted into the jar and replayed to the address, so a server answering for the look-alike name can fix a session or set application state. Exploitation requires the application to enable cookie support, address an origin by one of these spellings, and contact a host whose name ends in that spelling. This issue is fixed in versions 7.15.2 and 8.0.1.

Affected: Packagist: guzzlehttp/guzzle

### Impact

`SetCookie::matchesDomain()` gives every subdomain of a cookie `Domain` that cookie unless it recognizes the `Domain` as an IP literal or a numeric host, and it decides that from the domain's own text, so two spellings a transport reads as an address keep subdomain scope. On `7.15`, hexadecimal and mixed-base forms such as `0x7f000001` and `0177.0.0.0x1` go unrecognized while libcurl 8.21.0 reads both as `127.0.0.1`, so closing them completes the rule `GHSA-g446-98w2-8p5w` (`CVE-2026-59883`) set out to establish, which cited the WHATWG IPv4 parser and so already admitted a `0x` part. A percent-escaped `Domain` keeps that scope on both branches for a different reason: percent-decoding sits above numeric parsing, so `192.168.0.%31` and `127.0.0.1%2e` are registered names in the URI grammar rather than address literals, and no numeric rule in any base classifies them, while libcurl decodes the host before it resolves and reads them as `192.168.0.1` and `127.0.0.1`. The escape must fall in the rightmost label on `8.0.0`, which already catches a decimal, octal or `0x` part there, but not on `7.15`, where `%31%32%37.0.0.0x1` also reads as `127.0.0.1`; `8.0.0` is affected in the percent spelling alone.

Both directions of the defect are reproduced over a real socket. A cookie stored for `Domain=0x7f000001` is placed in the `Cookie` header of a request to `evil.0x7f000001`, disclosing a session identifier or token to a host that is not that address, and a response from `…

Affected: Ubuntu:24.04:LTS: guzzle, Ubuntu:26.04:LTS: guzzle

Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, SetCookie::matchesDomain() gives every subdomain of a cookie Domain that cookie unless SetCookie::matchesDomain() recognizes the Domain as an IP literal or a numeric host, and the decision comes from the domain's own text, so two spellings a transport reads as an address keep subdomain scope. Hexadecimal and mixed-base forms such as 0x7f000001 and 0177.0.0.0x1 go unrecognized while libcurl 8.21.0 reads both as 127.0.0.1. A percent-escaped Domain keeps that scope on both branches because percent-decoding sits above numeric parsing, so 192.168.0.%31 and 127.0.0.1%2e are registered names in the URI grammar rather than address literals, and no numeric rule in any base classifies them, while libcurl decodes the host before resolving and reads them as 192.168.0.1 and 127.0.0.1. A cookie stored for Domain=0x7f000001 is placed in the Cookie header of a request to evil.0x7f000001, disclosing a session identifier or token to a host that is not that address, and a response from evil.0x7f000001 setting Domain=0x7f000001 is accepted into the jar and replayed to the address, so a server answering for the look-alike name can fix a session or set application state. Exploitation requires the application to enable cookie support, address an origin by one of these spellings, and contact a host whose name ends in that spelling. This issue is fixed in versions 7.15.2 and 8.0.1.