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Fencer Vulns
medium 6.5

CVE-2026-8368 json

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

published 2026-05-12 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-29492

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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.

Patch / fix

  • OALDERS LWP::UserAgent 6.83
  • libwww-perl Debian 14 6.83-1

debian advisories DEBIAN-CVE-2026-8368

  • libwww-perl Ubuntu 22.04 LTS 6.61-1ubuntu0.1
  • libwww-perl Ubuntu 24.04 LTS 6.76-1ubuntu0.1
  • libwww-perl Ubuntu 25.10 6.78-1ubuntu0.1
  • libwww-perl Ubuntu 26.04 LTS 6.81-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-8368

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl-libwww-perl SLE Module for Basesystem 15 SP7 6.31-150000.3.3.1
  • perl-libwww-perl SLES for SAP applications 16.0, SLES 16.0 6.770.0-160000.3.1
  • perl-libwww-perl SLES LTSS Extended Security 12 SP5 6.05-6.3.1

suse advisories SUSE-SU-2026:3033-1SUSE-SU-2026:2962-1SUSE-SU-2026:22353-1

  • perl-libwww-perl openSUSE Leap 16.0 6.770.0-160000.3.1
  • perl-libwww-perl openSUSE Tumbleweed 6.830.0-1.1

opensuse advisories openSUSE-SU-2026:21045-1openSUSE-SU-2026:10781-1

  • perl-libwww-perl Azure Linux 3.0 6.83-1

azure linux advisories AZL-86907

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-8368 updated cvss 6.5

perl-libwww-perl: perl-libwww-perl: Information disclosure via cross-origin redirects

  • Red Hat Enterprise Linux 8 perl-libwww-perl Red Hat Enterprise Linux 9 perl-libwww-perl Red Hat Enterprise Linux 10 perl-libwww-perl
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

  • OALDERS LWP::UserAgent

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.