Detections
Analytics
Linux Distros Unpatched Vulnerability : CVE-2026-5545
medium Nessus Plugin ID 311003
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Synopsis
The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.Description
The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.- libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different credentials. An application that first uses Negotiate authentication to a server with `user1:password1` and then does another operation to the same server asking for any authentication method but for `user2:password2` (while the previous connection is still alive) - the second request gets confused and wrongly reuses the same connection and sends the new request over that connection thinking it uses a mix of user1's and user2's credentials when it is in fact still using the connection authenticated for user1... (CVE-2026-5545)
Note that Nessus relies on the presence of the package as reported by the vendor.
Solution
There is no known solution at this time.See Also
https://access.redhat.com/security/cve/cve-2026-5545
Plugin Details
Severity: Medium
ID: 311003
File Name: unpatched_CVE_2026_5545.nasl
Version: 1.8
Type: Local
Agent: unix
Family: Misc.
Published: 4/29/2026
Updated: 5/15/2026
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.0
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Temporal Score: 5.5
Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:C/A:N
CVSS Score Source: CVE-2026-5545
CVSS v3
Risk Factor: Medium
Base Score: 6.5
Temporal Score: 6.2
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Temporal Vector: CVSS:3.0/E:P/RL:U/RC:C
Vulnerability Information
CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:redhat:enterprise_linux:rust-std-static-x86_64-unknown-none, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:redhat:enterprise_linux:rust-analysis, p-cpe:/a:centos:centos:rustfmt, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:rust-src, p-cpe:/a:centos:centos:s390utils-osasnmpd, p-cpe:/a:redhat:enterprise_linux:rust-analyzer, p-cpe:/a:redhat:enterprise_linux:s390utils-base, p-cpe:/a:redhat:enterprise_linux:s390utils-iucvterm, p-cpe:/a:centos:centos:rust-gdb, p-cpe:/a:centos:centos:s390utils-zdsfs, p-cpe:/a:redhat:enterprise_linux:rust-std-static, p-cpe:/a:redhat:enterprise_linux:s390utils-hmcdrvfs, p-cpe:/a:centos:centos:rust-toolset, p-cpe:/a:centos:centos:rust, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:redhat:enterprise_linux:s390utils-chreipl-fcp-mpath, p-cpe:/a:centos:centos:s390utils, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:rust-std-static, p-cpe:/a:centos:centos:s390utils-iucvterm, p-cpe:/a:debian:debian_linux:curl, p-cpe:/a:redhat:enterprise_linux:trustee, p-cpe:/a:centos:centos:libcurl-minimal, p-cpe:/a:centos:centos:rust-lldb, p-cpe:/a:centos:centos:s390utils-ziomon, p-cpe:/a:redhat:enterprise_linux:rust-doc, p-cpe:/a:centos:centos:rust-std-static-wasm32-wasi, p-cpe:/a:centos:centos:curl, p-cpe:/a:redhat:enterprise_linux:s390utils-osasnmpd, p-cpe:/a:centos:centos:s390utils-chreipl-fcp-mpath, p-cpe:/a:redhat:enterprise_linux:s390utils-cpacfstatsd, p-cpe:/a:centos:centos:curl-minimal, p-cpe:/a:redhat:enterprise_linux:cargo, p-cpe:/a:redhat:enterprise_linux:s390utils-mon_statd, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:cargo, p-cpe:/a:centos:centos:rust-doc, p-cpe:/a:redhat:enterprise_linux:rust-gdb, p-cpe:/a:redhat:enterprise_linux:rust-lldb, p-cpe:/a:redhat:enterprise_linux:libcurl-devel, p-cpe:/a:centos:centos:clippy, p-cpe:/a:redhat:enterprise_linux:s390utils-cpuplugd, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:s390utils-cpacfstatsd, cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:centos:centos:rust-toolset-srpm-macros, p-cpe:/a:redhat:enterprise_linux:rust-toolset-srpm-macros, p-cpe:/a:redhat:enterprise_linux:libcurl, p-cpe:/a:redhat:enterprise_linux:rust, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:centos:centos:s390utils-mon_statd, p-cpe:/a:centos:centos:s390utils-cmsfs-fuse, p-cpe:/a:redhat:enterprise_linux:clippy, p-cpe:/a:centos:centos:libcurl, p-cpe:/a:redhat:enterprise_linux:s390utils, p-cpe:/a:centos:centos:rust-std-static-wasm32-unknown-unknown, p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-wasip1, p-cpe:/a:redhat:enterprise_linux:libcurl-minimal, p-cpe:/a:centos:centos:rust-std-static-x86_64-unknown-none, p-cpe:/a:redhat:enterprise_linux:rust-toolset, p-cpe:/a:centos:centos:snphost, p-cpe:/a:centos:centos:rust-analysis, p-cpe:/a:redhat:enterprise_linux:s390utils-cmsfs-fuse, p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-wasi, p-cpe:/a:centos:centos:rust-std-static-wasm32-wasip1, p-cpe:/a:redhat:enterprise_linux:trustee-guest-components, p-cpe:/a:redhat:enterprise_linux:rustfmt, p-cpe:/a:centos:centos:libcurl-devel, p-cpe:/a:redhat:enterprise_linux:s390utils-core, p-cpe:/a:centos:centos:rust-debugger-common, p-cpe:/a:centos:centos:trustee, p-cpe:/a:centos:centos:s390utils-devel, p-cpe:/a:centos:centos:s390utils-cpuplugd, p-cpe:/a:redhat:enterprise_linux:s390utils-zdsfs, p-cpe:/a:centos:centos:trustee-guest-components, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:redhat:enterprise_linux:s390utils-ziomon, p-cpe:/a:redhat:enterprise_linux:curl, p-cpe:/a:centos:centos:rust-src, p-cpe:/a:centos:centos:rust-std-static-aarch64-unknown-none-softfloat, cpe:/o:redhat:enterprise_linux:8, cpe:/o:debian:debian_linux:13.0, p-cpe:/a:centos:centos:rust-analyzer, p-cpe:/a:redhat:enterprise_linux:s390utils-se-data, p-cpe:/a:redhat:enterprise_linux:rust-std-static-aarch64-unknown-none-softfloat, p-cpe:/a:centos:centos:s390utils-hmcdrvfs, cpe:/o:centos:centos:7, p-cpe:/a:redhat:enterprise_linux:rust-std-static-wasm32-unknown-unknown, p-cpe:/a:canonical:ubuntu_linux:curl, p-cpe:/a:centos:centos:s390utils-se-data, p-cpe:/a:redhat:enterprise_linux:curl-minimal, p-cpe:/a:centos:centos:s390utils-base, p-cpe:/a:redhat:enterprise_linux:s390utils-devel, p-cpe:/a:redhat:enterprise_linux:rust-debugger-common, p-cpe:/a:centos:centos:s390utils-core, p-cpe:/a:redhat:enterprise_linux:snphost
Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier
Exploit Available: true
Exploit Ease: Exploits are available
Reference Information
CVE: CVE-2026-5545