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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-8368
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 15:16:19 UTC
Updated2026-05-19 18:16:30 UTC
DescriptionLWP::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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000330000 probability, percentile 0.097990000 (date 2026-05-26)

Problem Types: CWE-522 | CWE-522 CWE-522 Insufficiently Protected Credentials

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OALDERS LWPUserAgent affected 6.83 custom Not specified

References

ReferenceSourceLinkTags
github.com/libwww-perl/libwww-perl/pull/284 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
github.com/libwww-perl/libwww-perl/pull/512 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
www.openwall.com/lists/oss-security/2026/05/12/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
metacpan.org/release/OALDERS/libwww-perl-6.83/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Kai Aizen (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-11T00:00:00.000ZIssue reported.
CNA2026-05-12T00:00:00.000Zlibwww-perl 6.83 released with fix.

Solutions

CNA: Upgrade to libwww-perl 6.83 or later.

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