CVE-2026-80255 Affecting curl package, versions <8.21.0-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-CURL-19669741
- published11 Sept 2026
- disclosed6 Sept 2026
Introduced: 6 Sep 2026
NewCVE-2026-80255 (opens in a new tab)How to fix?
Upgrade Minimos:latest curl to version 8.21.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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://www.cve.org/CVERecord?id=CVE-2026-80255
- https://github.com/advisories/GHSA-vmmm-3jqx-jgx8
- https://osv.dev/vulnerability/MINI-pgw6-c2w6-p424
- https://osv.dev/vulnerability/CVE-2026-80255
- https://curl.se/docs/CVE-2026-80255.html
- https://curl.se/docs/CVE-2026-80255.json
- https://hackerone.com/reports/3972395