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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OALDERS | LWP::UserAgent | < 6.83 | 6.83 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libwww-perl | 6.83-1 | — |
| Debian 13 | libwww-perl | No fix yet | — |
| Debian 12 | libwww-perl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libwww-perl | 6.81-1ubuntu0.1 | USN-8378-1 |
| Ubuntu 25.10 | libwww-perl | 6.78-1ubuntu0.1 | USN-8378-1 |
| Ubuntu 24.04 LTS | libwww-perl | 6.76-1ubuntu0.1 | USN-8378-1 |
| Ubuntu 22.04 LTS | libwww-perl | 6.61-1ubuntu0.1 | USN-8378-1 |
| Ubuntu 20.04 LTS | libwww-perl | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libwww-perl | No fix yet | — |
| Ubuntu 16.04 LTS | libwww-perl | No fix yet | — |
| Ubuntu 14.04 LTS | libwww-perl | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | perl-libwww-perl | 6.31-150000.3.3.1 | SUSE-SU-2026:2962-1 |
| SLES 12 SP5 | perl-libwww-perl | 6.05-6.3.1 | SUSE-SU-2026:3033-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | perl-libwww-perl | 6.770.0-160000.3.1 | SUSE-SU-2026:22353-1 |
| SLES 16.0 | perl-libwww-perl | 6.770.0-160000.3.1 | SUSE-SU-2026:22353-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | perl-libwww-perl | 6.830.0-1.1 | openSUSE-SU-2026:10781-1 |
| openSUSE Leap 16.0 | perl-libwww-perl | 6.770.0-160000.3.1 | openSUSE-SU-2026:21045-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | perl-libwww-perl +1 | 6.58-1.amzn2023.0.3 | ALAS2023-2026-1764 |
| Amazon Linux 2 | perl-libwww-perl | 6.05-2.amzn2.0.1 | ALAS2-2026-3325 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | perl-libwww-perl | 6.83-1 | — |
Advisories 11
- WID-SEC-2026-2858 IBM AIX und VIOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 4, 2026
- NCSC-2026-0321 Meerdere kwetsbaarheden verholpen in IBM AIX en IBM PowerVM VIOS NCSC-NL (Netherlands) · Aug 21, 2026
- WID-SEC-2026-2503 Znuny: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen BSI CERT-Bund (WID) · Jul 23, 2026
- SUSE-SU-2026:3033-1 Security update for perl-libwww-perl SUSE / openSUSE Security Updates · Jul 16, 2026
- SUSE-SU-2026:2962-1 Security update for perl-libwww-perl SUSE / openSUSE Security Updates · Jul 15, 2026
- SUSE-SU-2026:22353-1 Security update for perl-libwww-perl SUSE / openSUSE Security Updates · Jul 2, 2026
- openSUSE-SU-2026:21045-1 Security update for perl-libwww-perl SUSE / openSUSE Security Updates · Jun 30, 2026
- ALAS2-2026-3325 Moderate: perl-libwww-perl security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- USN-8378-1 libwww-perl vulnerability Ubuntu Security Notices (USN) · Jun 3, 2026
- ALAS2023-2026-1764 Moderate: perl-libwww-perl security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 25, 2026
- openSUSE-SU-2026:10781-1 perl-libwww-perl-6.830.0-1.1 on GA media SUSE / openSUSE Security Updates · May 15, 2026
References
- https://github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patch patch
- https://metacpan.org/release/OALDERS/libwww-perl-6.83/changes release-notes
- https://github.com/libwww-perl/libwww-perl/pull/512 issue-tracking
- https://github.com/libwww-perl/libwww-perl/pull/284 related