CVE-2026-8368

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductLWP::UserAgent

PublishedMay 12, 2026

First seenMay 12, 2026

Weakness typeCWE-522CWE-522

How to fix

Update

OALDERS LWP::UserAgent6.83 or later

Patches

github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patch

Vendor advisories

metacpan.org/release/OALDERS/libwww-perl-6.83/changes

Affected products

Product	Affected versions	Fixed in
OALDERS LWP::UserAgent	v < 6.83	6.83

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