CVE catalog
CVE-2026-3784
curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a s
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.42% · Oct 25, 2026
curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection.
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 | fixed |
| Debian | curl | trixie-security | 8.14.1-2+deb13u7 | fixed |
| Debian | curl | bookworm | 7.88.1-10+deb12u15 | fixed |
| Debian | curl | bookworm-security | 7.88.1-10+deb12u5 | vulnerable |
| Cpe | curl | Not reported | 7.88.1-10+deb12u15 | fixed |
| Cpe | curl | Not reported | 8.5.0-2ubuntu10.8 | fixed |
| Cpe | libcurl3t64-gnutls | Not reported | 8.5.0-2ubuntu10.8 | fixed |
| Cpe | libcurl4-doc | Not reported | 8.5.0-2ubuntu10.8 | fixed |
| Cpe | libcurl4-gnutls-dev | Not reported | 8.5.0-2ubuntu10.8 | fixed |
| Cpe | libcurl4-openssl-dev | Not reported | 8.5.0-2ubuntu10.8 | fixed |
| Cpe | libcurl4t64 | Not reported | 8.5.0-2ubuntu10.8 | fixed |
| Cpe | curl | Not reported | 8.18.0 | fixed |
| Alpine | curl | 3.21 | 8.14.1-r3 | fixed |
| Alpine | curl | 3.22 | 8.14.1-r4 | fixed |
| Alpine | curl | 3.23 | 8.19.0-r0 | fixed |
| Alpine | curl | 3.24 | 8.19.0-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | curl | source | sid | 8.19.0-1 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | forky | 8.19.0-1 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | trixie | 8.14.1-2+deb13u4 | not yet assigned | Not reported | Not reported |
| Debian | curl | source | bookworm | 7.88.1-10+deb12u15 | not yet assigned | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 7.88.1-10+deb12u15 | Not reported | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 8.5.0-2ubuntu10.8 | Not reported | Not reported | Not reported |
| Cpe | libcurl3t64-gnutls | cpe | Not reported | 8.5.0-2ubuntu10.8 | Not reported | Not reported | Not reported |
| Cpe | libcurl4-doc | cpe | Not reported | 8.5.0-2ubuntu10.8 | Not reported | Not reported | Not reported |
| Cpe | libcurl4-gnutls-dev | cpe | Not reported | 8.5.0-2ubuntu10.8 | Not reported | Not reported | Not reported |
| Cpe | libcurl4-openssl-dev | cpe | Not reported | 8.5.0-2ubuntu10.8 | Not reported | Not reported | Not reported |
| Cpe | libcurl4t64 | cpe | Not reported | 8.5.0-2ubuntu10.8 | Not reported | Not reported | Not reported |
| Cpe | curl | cpe | Not reported | 8.18.0 | Not reported | NVD-CVE-2026-3784 | Not reported |
| Alpine | curl | apk | 3.21 | 8.14.1-r3 | Not reported | ALPINE-CVE-2026-3784 | Not reported |
| Alpine | curl | apk | 3.22 | 8.14.1-r4 | Not reported | ALPINE-CVE-2026-3784 | Not reported |
| Alpine | curl | apk | 3.23 | 8.19.0-r0 | Not reported | ALPINE-CVE-2026-3784 | Not reported |
| Alpine | curl | apk | 3.24 | 8.19.0-r0 | Not reported | ALPINE-CVE-2026-3784 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [curl]Affected
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· arm64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· amd64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· arm64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
- [libcurl3-gnutls]Affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· arm64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· amd64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· arm64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
- [libcurl3-nss]Affected
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· arm64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· amd64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· arm64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
- [libcurl4]Affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· arm64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· amd64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· arm64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
- [libcurl4-doc]Affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· all · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· all · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· all · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· all · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· all · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
- [libcurl4-gnutls-dev]Affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· arm64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· amd64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· arm64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
- [libcurl4-nss-dev]Affected
Source package: [curl]
Details (4)
7.88.1-10+deb12u15· amd64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· arm64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· amd64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· arm64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
- [libcurl4-openssl-dev]Affected
Source package: [curl]
Details (6)
7.88.1-10+deb12u15· amd64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u15· arm64 · bookwormFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· amd64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
8.14.1-2+deb13u2~bpo13+1· arm64 · bookworm-backportsFixed · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· amd64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
7.88.1-10+deb12u5· arm64 · bookworm-securityAffected · Fixed:
7.88.1-10+deb12u15nvd · curl · debian · bookworm; nvd · curl · debian · 12
[Debian 13 (Trixie)]
- [curl]Fixed
Details (5)
8.14.1-2+deb13u4· amd64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u4· arm64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u7· amd64 · trixie-securityFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
- [libcurl3t64-gnutls]Fixed
Source package: [curl]
Details (5)
8.14.1-2+deb13u4· amd64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u4· arm64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u7· amd64 · trixie-securityFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
- [libcurl4-doc]Fixed
Source package: [curl]
Details (5)
8.14.1-2+deb13u4· all · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u4· all · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· all · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· all · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u7· all · trixie-securityFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
- [libcurl4-gnutls]Fixed
Source package: [curl]
Details (2)
8.21.0-2~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
- [libcurl4-gnutls-dev]Fixed
Source package: [curl]
Details (5)
8.14.1-2+deb13u4· amd64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u4· arm64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u7· amd64 · trixie-securityFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
- [libcurl4-openssl-dev]Fixed
Source package: [curl]
Details (5)
8.14.1-2+deb13u4· amd64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u4· arm64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u7· amd64 · trixie-securityFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
- [libcurl4t64]Fixed
Source package: [curl]
Details (5)
8.14.1-2+deb13u4· amd64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u4· arm64 · trixieFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· amd64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.21.0-2~bpo13+1· arm64 · trixie-backportsFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
8.14.1-2+deb13u7· amd64 · trixie-securityFixed · Fixed:
8.14.1-2+deb13u4nvd · curl · debian · 13
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-253495.json]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_55432.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-3784]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-3784]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-3784]
- [https://security-tracker.debian.org/tracker/CVE-2026-3784]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3784.json]
- [https://ubuntu.com/security/notices/USN-8084-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2189.json]
[CERT-Bund public advisories] · [CISA cybersecurity 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)]