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CVE WatchSep 6, 2026

CVE-2026-80255

A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of space (ascii code 32) immediately before the `Secure` attribute c

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 6, 2026 · Last modified: Sep 6, 2026

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references
Related CVEs

No related CVEs by CWE or product.