======================================================================== CVE-2026-8368 CPAN Security Group ========================================================================

CVE ID: CVE-2026-8368 Distribution: libwww-perl Versions: before 6.83

MetaCPAN: https://metacpan.org/dist/libwww-perl VCS Repo: https://github.com/libwww-perl/libwww-perl

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

Description ----------- 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.

Problem types ------------- - CWE-522 Insufficiently Protected Credentials

Solutions --------- Upgrade to libwww-perl 6.83 or later.

References ---------- https://github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patch https://metacpan.org/release/OALDERS/libwww-perl-6.83/changes https://github.com/libwww-perl/libwww-perl/pull/512 https://github.com/libwww-perl/libwww-perl/pull/284

Timeline -------- - 2026-05-11: Issue reported. - 2026-05-12: libwww-perl 6.83 released with fix.

Credits ------- Kai Aizen, reporter

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