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CVE-2026-80255

secure cookie attribute bypass with tab

High7.5EPSS 0.48%
Published
Updated
Reserved
Assigned by
curl

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.

Scores

CVSS scores of CVE-2026-80255, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.48% · top 59% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: poc · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • curl · curl

    • affected 8.13.0 – < 8.14.2
    • affected 8.15.0 – < 8.16.1
    • affected 8.17.0 – < 8.20.1
    • affected 8.21.0 – < 8.22.0

  • curl · curl

    • affected 1aea05a6c2699e80c75936d58569851555acd603 – < 4f6aa41a0145e930e766775dbe860883d350aa0a

  • curl · curl

    • affected 8.21.0
    • affected 8.20.0
    • affected 8.19.0
    • affected 8.18.0
    • affected 8.17.0
    • affected 8.16.0
    • affected 8.15.0
    • affected 8.14.1
    • affected 8.14.0
    • affected 8.13.0

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .