CVE-2026-80255 — secure cookie attribute bypass with tab
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 withou…
Published: 2026-09-06 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7