The HTTP wrapper treats response header lines that contain no colon as valid headers, which can lead to misinterpreted responses.
Affected versions
| Branch | Affected | Fixed in |
|---|---|---|
| PHP 8.4 | < 8.4.5 | 8.4.5 |
| PHP 8.3 | < 8.3.19 | 8.3.19 |
| PHP 8.2 | < 8.2.28 | 8.2.28 |
| PHP 8.1 | < 8.1.32 | 8.1.32 |
Older branches: not assessed
Exploitation conditions
No special conditions are documented.
Remediation
Upgrade to 8.1.32, 8.2.28, 8.3.19, 8.4.5 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
| CVSS | Source | Vector |
|---|---|---|
| 6.3 v4.0 | CNA | — |
References
Data provenance
Secondary sources · pending primary verificationLast reviewed: Oct 24, 2026 · Source