CVE-2026-91766

Publication date 25 September 2026

Last updated 20 October 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.9 · Medium

Score breakdown

Description

When the http:// stream wrapper follows a redirect it forwards the user-supplied Authorization, Cookie and Proxy-Authorization headers unchanged, even when the redirect target is a different host, a different port, or a downgrade from HTTPS to HTTP. A server that can steer a redirect therefore receives credentials that were only meant for the original origin. This is the same class of issue that libcurl fixed in 7.58.0 ( CVE-2018-1000007 https://github.com/advisories/GHSA-g7x2-hrfp-pv5f ).

Read the notes from the security team

Status

Package Ubuntu Release Status
php5 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
14.04 LTS trusty
Fixed in 5.5.9+dfsg-1ubuntu4.29+esm17
php7.0 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
16.04 LTS xenial
Fixed in 7.0.33-0ubuntu0.16.04.16+esm21
php7.2 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
18.04 LTS bionic
Fixed in 7.2.24-0ubuntu0.18.04.17+esm13
php7.4 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal
Fixed in 7.4.3-4ubuntu2.29+esm4
php8.1 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Fixed in 8.1.2-1ubuntu2.27
php8.3 26.10 stonking Not in release
26.04 LTS resolute Not in release
24.04 LTS noble
Fixed in 8.3.6-0ubuntu0.24.04.12
22.04 LTS jammy Not in release
php8.5 26.10 stonking
Fixed in 8.5.9-0ubuntu2
26.04 LTS resolute
Fixed in 8.5.4-0ubuntu1.4
24.04 LTS noble Not in release
22.04 LTS jammy Not in release

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

Notes

sbeattie

PEAR issues should go against php-pear as of xenial PEAR issues should go against php-pear as of xenial

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
php8.3
php8.5

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.9 · Medium

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

References

Related Ubuntu Security Notices (USN)

Other references

Access our resources on patching vulnerabilities