CVE-2026-93682

Out-of-bounds read in the HTTP stream wrapper when following a redirect with an empty Location header

Published Sep 25, 2026 CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed
Description
When the HTTP stream wrapper follows a redirect and the response carries a Location header with an empty value, the redirect code reads one byte past the end of the heap buffer holding the location. The value of that out-of-bounds byte decides which redirect target is built, so a malicious server controls whether the client is sent to the host root or to the current directory.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4819-1 php8.2 security update
Debian DSA Debian DSA DSA-6514-1 php8.4 security update
Ubuntu USN Ubuntu USN USN-8936-1 PHP vulnerabilities
History
Type Values Removed Values Added
First Time appeared Php
Php php
CPEs cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
Vendors & Products Php
Php php
Type Values Removed Values Added
First Time appeared Php Group
Php Group php
Vendors & Products Php Group
Php Group php
Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description When the HTTP stream wrapper follows a redirect and the response carries a Location header with an empty value, the redirect code reads one byte past the end of the heap buffer holding the location. The value of that out-of-bounds byte decides which redirect target is built, so a malicious server controls whether the client is sent to the host root or to the current directory.
Title Out-of-bounds read in the HTTP stream wrapper when following a redirect with an empty Location header
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
php
Published
Updated
Sep 25, 2026, 8:38 PM
Reserved
Sep 18, 2026, 2:18 PM
Status
Analyzed
Published
Sep 25, 2026, 8:17 PM
Modified
Oct 23, 2026, 2:58 PM
Severity
Moderate
Public date
Sep 25, 2026, 8:02 PM