CVE-2026-80255
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductHaxx Curl
PublishedSep 6, 2026
First seenSep 6, 2026
Weakness typeCWE-201CWE-201
How to fix
Update
- haxx curl8.22.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| haxx curl | 8.13.0 ≤ v < 8.22.0 | 8.22.0 |
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