CVE-2026-80255

    Dashboard / Vulnerabilities / CVE-2026-80255

    CVE-2026-80255

    Published: 6 Sept 2026Last Modified: 17 Sept 2026

    Summary: secure cookie attribute bypass with tab

    Details: 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.

    References: https://curl.se/docs/CVE-2026-80255.html, https://curl.se/docs/CVE-2026-80255.json, https://hackerone.com/reports/3972395, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80255.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80255, https://github.com/curl/curl.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 1c3149881769e7bd79b072e48374e4c2b3678b2f
    Fixed -01346829096c61b372692f6dc43ffa778c6caccd

    Affected versions

    8.13.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-80255 | CVE-DB