CVE-2026-8368
LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects
- State
- Published
- Severity
- 6.5 Medium
- Published
- May 12, 2026
- Updated
- May 19, 2026
- Reserved
- May 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | CISA-ADP |
Weaknesses
- CWE-522 Insufficiently Protected Credentials
Affected Products
| Product | Versions |
|---|---|
LWP::UserAgentOALDERS |
|
References
- https://github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patchpatch
- https://metacpan.org/release/OALDERS/libwww-perl-6.83/changesrelease-notes
- https://github.com/libwww-perl/libwww-perl/pull/512issue-tracking
- https://github.com/libwww-perl/libwww-perl/pull/284related
- http://www.openwall.com/lists/oss-security/2026/05/12/7
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