| Name | CVE-2026-86409 |
| Description | Setting `CURLOPT_AWS_SIGV4` to NULL but does not disable SigV4 authentication, contrary to expectations and documentation. A subsequent transfer on the same handle still sends an `Authorization: AWS4-HMAC-SHA256` header to whatever URL isset next, leaking state information. |
| 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) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| curl (PTS) | bookworm | 7.88.1-10+deb12u15 | vulnerable |
| bookworm (security) | 7.88.1-10+deb12u5 | vulnerable | |
| trixie | 8.14.1-2+deb13u5 | vulnerable | |
| trixie (security) | 8.14.1-2+deb13u7 | vulnerable | |
| forky | 8.22.0-1 | fixed | |
| sid | 8.23.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| curl | source | (unstable) | 8.22.0-1 |
[trixie] - curl <no-dsa> (Minor issue)
https://curl.se/docs/CVE-2026-86409.html
Introduced with: https://github.com/curl/curl/commit/08e8455dddc5e48e58a12ade3815c01ae3da3b64 (curl-7_75_0)
Fixed by: https://github.com/curl/curl/commit/c3c70440e8d9938c0bb732595751e8aebc614f24 (curl-8_22_0)