Affected: Alpaquita:25: libgit2, Alpaquita:stream: libgit2

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, the built-in HTTP transport in src/libgit2/transports/http.c follows an offsite initial redirect, and handle_remote_auth and handle_auth pass transport->owner->url instead of transport->server.url to the credential callback when the redirected host returns 401 Unauthorized. A callback that scopes credentials to the original trusted URL can therefore return GIT_CREDENTIAL_USERPASS_PLAINTEXT credentials that libgit2 stores in transport->server.cred and sends as an Authorization header to the redirected host. An attacker who controls a trusted Git host or an open redirect on that host can disclose HTTP Basic credentials, personal access tokens, or equivalent credentials. This issue is fixed in versions 1.8.6 and 1.9.5.

libgit2-1_9-1.9.6-1.1 on GA media

libgit2: libgit2: Network attacker can intercept HTTPS connections via inverted IP SubjectAltName comparison libgit2: libgit2: Submodule path traversal allows arbitrary directory creation libgit2: libgit2: Denial of Service via Unbounded Memory Allocation libgit2: libgit2: Information disclosure via HTTP redirect allows credential leakage libgit2: libgit2: Denial of Service due to heap out-of-bounds read from malicious Git server

Affected: Ubuntu:Pro:20.04:LTS: libgit2, Ubuntu:Pro:22.04:LTS: libgit2, Ubuntu:24.04:LTS: libgit2, Ubuntu:26.04:LTS: libgit2

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, the built-in HTTP transport in src/libgit2/transports/http.c follows an offsite initial redirect, and handle_remote_auth and handle_auth pass transport->owner->url instead of transport->server.url to the credential callback when the redirected host returns 401 Unauthorized. A callback that scopes credentials to the original trusted URL can therefore return GIT_CREDENTIAL_USERPASS_PLAINTEXT credentials that libgit2 stores in transport->server.cred and sends as an Authorization header to the redirected host. An attacker who controls a trusted Git host or an open redirect on that host can disclose HTTP Basic credentials, personal access tokens, or equivalent credentials. This issue is fixed in versions 1.8.6 and 1.9.5.