PHP security advisory

HTTP stream wrapper leaks credentials on cross-origin redirects

CVE-2026-91766Not rated Published Stream HTTP wrapper

The HTTP stream wrapper can forward credentials to a different origin when following a redirect.

Affected versions

BranchAffectedFixed in
PHP 8.5< 8.5.118.5.11
PHP 8.4< 8.4.268.4.26
PHP 8.3< 8.3.358.3.35
PHP 8.2< 8.2.348.2.34

Older branches: not assessed

Exploitation conditions

  • Application fetches URLs with credentials via the http:// wrapper and follows redirects

Remediation

Upgrade to 8.2.34, 8.3.35, 8.4.26, 8.5.11 or a later release of your branch. If your branch is end-of-life, move to a supported branch. Distribution packages may carry a backported fix under an older version number; confirm with your vendor's security tracker.

A version number alone cannot prove patch status. Linux distributions and hosting providers often backport security fixes without changing the version. Check your vendor’s changelog.

Severity scores

No CVSS score recorded in our dataset yet. Check NVD for the latest scoring.

References

Data provenance

Secondary sources · pending primary verification

Last reviewed: Oct 24, 2026 · Source

Notes: Assembled from secondary sources (distribution trackers, release coverage). Publication date reflects the upstream fix release. Severity not yet verified unless a score is listed.