CVE-2026-8368
Publication date 12 May 2026
Last updated 6 June 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libwww-perl | 26.04 LTS resolute |
Fixed 6.81-1ubuntu0.1
|
| 25.10 questing |
Fixed 6.78-1ubuntu0.1
|
|
| 24.04 LTS noble |
Fixed 6.76-1ubuntu0.1
|
|
| 22.04 LTS jammy |
Fixed 6.61-1ubuntu0.1
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.5 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-8378-1
- libwww-perl vulnerability
- 3 June 2026