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CVE-2026-80255 Details
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.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 8, 2026Exploitation: PocAutomatable: YesTechnical Impact: Partial
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://hackerone.com/reports/3972395 | CISA-ADP | ExploitMitigationThird Party Advisory |
| https://curl.se/docs/CVE-2026-80255.html | curl | PatchVendor Advisory |
| https://curl.se/docs/CVE-2026-80255.json | curl | Vendor Advisory |
| https://hackerone.com/reports/3972395 | curl | ExploitMitigationThird Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-201 | Insertion of Sensitive Information Into Sent Data | CISA-ADP |
| CWE-201 | Insertion of Sensitive Information Into Sent Data | curl |
Affected Products
| Product | Versions |
|---|---|
| haxx curl | >= 8.13.0, < 8.22.0 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | CVE Modified | curl |
| Sep 11, 2026 | Initial Analysis | [email protected] |
| Sep 8, 2026 | CVE Modified | CISA-ADP |
| Sep 6, 2026 | New CVE Received | curl |