| Name | CVE-2026-11564 |
| Description | libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer. |
| 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) | bullseye | 7.74.0-1.3+deb11u13 | fixed |
| bullseye (security) | 7.74.0-1.3+deb11u16 | fixed |
| bookworm | 7.88.1-10+deb12u15 | fixed |
| bookworm (security) | 7.88.1-10+deb12u5 | fixed |
| trixie | 8.14.1-2+deb13u4 | fixed |
| forky | 8.20.0-5 | vulnerable |
| sid | 8.21.0-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| curl | source | bullseye | (not affected) | | | |
| curl | source | bookworm | (not affected) | | | |
| curl | source | trixie | (not affected) | | | |
| curl | source | (unstable) | 8.21.0~rc2-1 | | | |
Notes
[trixie] - curl <not-affected> (Vulnerable code not present)
[bookworm] - curl <not-affected> (Vulnerable code not present)
[bullseye] - curl <not-affected> (Vulnerable code not present)
https://curl.se/docs/CVE-2026-11564.html
Introduced with: https://github.com/curl/curl/commit/eefd03c572996e5de4dec4fe295ad6f103e0eefc (curl-8_17_0)
Fixed by: https://github.com/curl/curl/commit/d69bfad3fa3daf5e72331f6870667607828d5891 (rc-8_21_0-2, curl-8_21_0)