| Name | CVE-2026-80255 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| curl (PTS) | bookworm | 7.88.1-10+deb12u15 | fixed |
| bookworm (security) | 7.88.1-10+deb12u5 | fixed |
| trixie | 8.14.1-2+deb13u5 | vulnerable |
| forky | 8.21.0-2 | vulnerable |
| sid | 8.22.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | bookworm | (not affected) | | | |
| curl | source | (unstable) | 8.22.0-1 | | | |
Notes
[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <not-affected> (Vulnerable code introduced later)
https://curl.se/docs/CVE-2026-80255.html
Introduced with: https://github.com/curl/curl/commit/1aea05a6c2699e80c75936d58569851555acd603 (curl-8_13_0)
Fixed by: https://github.com/curl/curl/commit/4f6aa41a0145e930e766775dbe860883d350aa0a (curl-8_22_0)