CVE-2026-80255

HIGH CVSS 3.1: 7.5 EPSS 0.68%
Updated Sep 15, 2026
Curl
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions 8.13.0 — 8.22.0
Fixed In 8.22.0
Type CWE-201, CWE-201 Information Exposure Through Sent Data
Vendor Curl
Public PoC No

A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of space (ascii code 32) immediately before the `Secure` attribute causes curl to store the cookie without its Secure flag. The cookie might then wrongfully be sent over plaintext HTTP on subsequent requests to the same host.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Haxx Curl
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
8.13.0 8.22.0