CVE catalog
CVE-2026-11564
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
- Severity
- Critical · CVSS 9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.61% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | curl | sid | 8.23.0-1 | fixed |
| Debian | curl | forky | 8.22.0-1 | fixed |
| Debian | curl | trixie | 8.14.1-2+deb13u5 | not affected |
| Debian | curl | trixie-security | 8.14.1-2+deb13u7 | not affected |
| Debian | curl | bookworm | 7.88.1-10+deb12u15 | not affected |
| Debian | curl | bookworm-security | 7.88.1-10+deb12u5 | not affected |
| Cpe | curl | Not reported | 8.5.0-2ubuntu10.11 | fixed |
| Cpe | libcurl3t64-gnutls | Not reported | 8.5.0-2ubuntu10.11 | fixed |
| Cpe | libcurl4-doc | Not reported | 8.5.0-2ubuntu10.11 | fixed |
| Cpe | libcurl4-gnutls-dev | Not reported | 8.5.0-2ubuntu10.11 | fixed |
| Cpe | libcurl4-openssl-dev | Not reported | 8.5.0-2ubuntu10.11 | fixed |
| Cpe | libcurl4t64 | Not reported | 8.5.0-2ubuntu10.11 | fixed |
| Cpe | curl | Not reported | 8.21.0 | fixed |
| Cpe | curl | Not reported | Not reported | not affected |
| Cpe | curl | Not reported | 8.21.0 | fixed |
| Alpine | curl | 3.23 | 8.22.0-r0 | fixed |
| Alpine | curl | 3.24 | 8.21.0-r0 | fixed |
| Ubuntu | curl | 26.04 | 8.14.1-2ubuntu1 | vulnerable |
| Ubuntu | curl | 26.04 | 8.17.0-1ubuntu1 | vulnerable |
| Ubuntu | curl | 26.04 | 8.18.0-1ubuntu1 | vulnerable |
| Ubuntu | curl | 26.04 | 8.18.0-1ubuntu2 | vulnerable |
| Ubuntu | curl | 26.04 | 8.18.0-1ubuntu2.1 | vulnerable |
| Ubuntu | curl | 26.04 | 8.18.0-1ubuntu2.2 | vulnerable |
| Ubuntu | curl | 26.04 | 8.18.0-1ubuntu2.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | curl | source | sid | 8.21.0~rc2-1 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | forky | 8.21.0~rc2-1 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | curl | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 8.5.0-2ubuntu10.11 | Not reported | Not reported | Not reported |
| Cpe | libcurl3t64-gnutls | cpe | Not reported | 8.5.0-2ubuntu10.11 | Not reported | Not reported | Not reported |
| Cpe | libcurl4-doc | cpe | Not reported | 8.5.0-2ubuntu10.11 | Not reported | Not reported | Not reported |
| Cpe | libcurl4-gnutls-dev | cpe | Not reported | 8.5.0-2ubuntu10.11 | Not reported | Not reported | Not reported |
| Cpe | libcurl4-openssl-dev | cpe | Not reported | 8.5.0-2ubuntu10.11 | Not reported | Not reported | Not reported |
| Cpe | libcurl4t64 | cpe | Not reported | 8.5.0-2ubuntu10.11 | Not reported | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 8.21.0 | Not reported | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 8.21.0 | Not reported | NVD-CVE-2026-11564 | Not reported |
| Alpine | curl | apk | 3.23 | 8.22.0-r0 | Not reported | ALPINE-CVE-2026-11564 | Not reported |
| Alpine | curl | apk | 3.24 | 8.21.0-r0 | Not reported | ALPINE-CVE-2026-11564 | Not reported |
| Ubuntu | curl | deb | 26.04 | 8.18.0-1ubuntu2.3 | Not reported | UBUNTU-CVE-2026-11564 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [curl]Not affected
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl3-gnutls]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl3-nss]Not affected
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-doc]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· all · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· all · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· all · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· all · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-gnutls-dev]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-nss-dev]Not affected
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
- [libcurl4-openssl-dev]Not affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u15· arm64 · bookwormNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· amd64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
7.88.1-10+deb12u5· arm64 · bookworm-securityNot affected
nvd · curl · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-11564]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-11564]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-11564]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-11564]
- [https://security-tracker.debian.org/tracker/CVE-2026-11564]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11564.json]
- [https://ubuntu.com/security/notices/USN-8525-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2052.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]