Is CVE-2026-8368 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-8368 being exploited in the wild.

How severe is CVE-2026-8368?

Medium severity, with a CVSS score of 6.5, published 12 May 2026.

Is there a fix for CVE-2026-8368?

A patch was published on 2026-05-12: libwww-perl 6.83 released. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-8368 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-8368?

Check whether you run Libwww-Perl at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-8368: libwww-perl LWP::UserAgent credential leak on cross-origin redirects

CVE-2026-8368 · Severity: medium · CVSS 6.5 · Published 2026-05-12

A vulnerability in a popular Perl web library could allow attackers to steal sensitive login credentials. When the library follows a link that redirects to a different website, it fails to remove security tokens and passwords from the request. An attacker who controls a website can use this to trick the library into sending them a user's private authentication data.

Vendors: Libwww-Perl.

Quick answers

Is CVE-2026-8368 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-8368 being exploited in the wild.
How severe is CVE-2026-8368?: Medium severity, with a CVSS score of 6.5, published 12 May 2026.
Which products and versions are affected?: Libwww-Perl < 6.83.
Is there a fix for CVE-2026-8368?: A patch was published on 2026-05-12: libwww-perl 6.83 released. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-8368 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-8368?: Check whether you run Libwww-Perl at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

LWP::UserAgent in libwww-perl versions prior to 6.83 contains a credential leak vulnerability (CWE-522). When handling HTTP 3xx redirects, the library's redirect handler only strips 'Host' and 'Cookie' headers before issuing the follow-up request. If a request is redirected to a different origin (different scheme, host, or port), caller-supplied 'Authorization' and 'Proxy-Authorization' headers are forwarded unchanged. An attacker can exploit this by inducing a redirect to a malicious server to capture these credentials. The issue is fixed in version 6.83, which now strips these headers on cross-origin redirects unless the 'allow_credentialed_redirects' option is explicitly enabled.

Affected products

libwww-perl project libwww-perl < 6.83

Timeline

2026-05-11: disclosed: Issue reported to maintainers.
2026-05-12: patched: libwww-perl 6.83 released.
2026-05-12: advisory: Public disclosure of CVE-2026-8368.

References

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