CVE-2026-80255
highA `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…
Vendor / product: Haxx — curl
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.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Severity source: NVD CVSS v3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
Timeline (UTC)
Published: 2026-09-06 18:17
Modified: 2026-09-15 07:16
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 06:50 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
haxx / curl ≥8.13.0 <8.22.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://curl.se/docs/CVE-2026-80255.html
Vendor advisory: https://curl.se/docs/CVE-2026-80255.json
Patch / mitigation: https://curl.se/docs/CVE-2026-80255.html
Patch / mitigation: https://hackerone.com/reports/3972395
Patch / mitigation: https://hackerone.com/reports/3972395
References
- https://curl.se/docs/CVE-2026-80255.html 2499f714-1537-4658-8207-48ae4bb9eae9
- https://curl.se/docs/CVE-2026-80255.json 2499f714-1537-4658-8207-48ae4bb9eae9
- https://hackerone.com/reports/3972395 2499f714-1537-4658-8207-48ae4bb9eae9
- https://hackerone.com/reports/3972395 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:50 UTC · record ↗