CVE-2026-93682

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

MEDIUM
5.8
CVSS Score
Published: September 25, 2026 at 08:02 PM UTC
Updated: October 23, 2026 at 02:58 PM UTC
1 product affected across 1 vendorPHP

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Severity
MEDIUM5.8
Exploit prediction
EPSS 0.3%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PHP· PHPdrupal
95%
8.2.0 ≤ v < 8.2.348.3.0 ≤ v < 8.3.358.4.0 ≤ v < 8.4.268.5.0 ≤ v < 8.5.118.2.*8.3.*8.4.*8.5.*
Affected range stops below 8.2.34, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.3.35, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.4.26, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.11, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.8MEDIUMphp
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-125

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