CVE-2026-8368 — LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirec…

Affected: OALDERS LWP::UserAgent

LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects.

On a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.

A redirect to an attacker controlled host therefore discloses the caller's credentials to that host.

USN-8378-1 — libwww-perl vulnerability

Affected: Ubuntu:22.04:LTS: libwww-perl, Ubuntu:24.04:LTS: libwww-perl, Ubuntu:25.10: libwww-perl, Ubuntu:26.04:LTS: libwww-perl

It was discovered that libwww-perl incorrectly handled redirects. A remote attacker could possibly use this issue to obtain sensitive information by causing Authorization headers to be sent to a different host.

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CVE-2026-8368 — LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirec…

USN-8378-1 — libwww-perl vulnerability