LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects
CVE-2026-8368 is fixed in 3 products on 1 platform, first by libwww-perl 6.61-1ubuntu0.1, released May 12, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libwww-perl · Debian 14 | 6.83-1 | DEBIAN-CVE-2026-8368 | May 27, 2026 |
| libwww-perl · Ubuntu 22.04.1 LTS (jammy) | 6.61-1ubuntu0.1 | libwww-perl 6.61-1ubuntu0.1 | May 12, 2026 |
| libwww-perl · Ubuntu 24.04.5 LTS (noble) | 6.76-1ubuntu0.1 | libwww-perl 6.76-1ubuntu0.1 | May 12, 2026 |
| libwww-perl · Ubuntu 25.10 (questing) | 6.78-1ubuntu0.1 | libwww-perl 6.78-1ubuntu0.1 | May 12, 2026 |
| libwww-perl · Ubuntu 26.04.1 LTS (resolute) | 6.81-1ubuntu0.1 | libwww-perl 6.81-1ubuntu0.1 | May 12, 2026 |
| perl-libwww-perl · amzn 2023 | 6.58-1.amzn2023.0.3 | ALAS2023-2026-1764 | May 25, 2026 |
| perl-libwww-perl · opensuse-leap 16.0 | 6.770.0-160000.3.1 | OPENSUSE-SU-2026:21045-1 | Jun 24, 2026 |
| perl-libwww-perl · sles 15.7 | 6.31-150000.3.3.1 | SUSE-SU-2026:2962-1 | Jul 14, 2026 |
| perl-libwww-perl · sles 16.0 | 6.770.0-160000.3.1 | SUSE-SU-2026:22353-1 | Jun 24, 2026 |
| perl-libwww-perl-tests · amzn 2023 | 6.58-1.amzn2023.0.3 | ALAS2023-2026-1764 | May 25, 2026 |
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