libcurl's connection cache match function never considers the automatic client certificate option, so a cached, already authenticated Schannel connection can be handed to a transfer that got redirected to a different origin, even though the code explicitly switched off the auto client cert option for that transfer to prevent exactly this.

The remote host is affected by the vulnerability described in GLSA-202611-07 (curl: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in curl. Please review the CVE identifiers referenced below     for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - During an upload, curl mishandles HTTP/2 `RST_STREAM` received from the server (with reason
    `HTTP_1_1_REQUIRED` or `REFUSED_STREAM`) leading to a use after free of a `struct Curl_easy` object.
    (CVE-2026-92392)

  - 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. (CVE-2026-86409)

  - A flaw in the curl command line tool's logic makes it only set SSH host verification options when
    interacting directly using SFTP or SCP, and not as a result of following a redirect. (CVE-2026-86410)

  - An `ftp://` transfer configured with `CURLUSESSL_NONE` can reuse a pooled FTP control connection that a
    previous easy handle upgraded with `STARTTLS` and authenticated using a client certificate. The second
    handle performs neither a new TLS handshake nor a new FTP login, so the server continues to authorize it
    under the first handle's certificate identity. (CVE-2026-86411)

  - A remote HTTP server can set a cookie that curl accepts and writes to a Netscape cookie jar but cannot
    reload. On the next invocation using the same path for `--cookie` and `--cookie-jar`, curl fails before
    connecting, then the cleanup procedure replaces the jar with an empty file, deleting cookies for unrelated
    domains. (CVE-2026-86412)

The version of curl installed on the remote host is 8.21.0 prior to 8.23.0. It is, therefore, affected by multiple connection reuse vulnerabilities:

  - libcurl's connection cache match function never considers the automatic client certificate     option, so a cached, already authenticated Schannel connection can be handed to a transfer     that got redirected to a different origin, even though the code explicitly switched off the     auto client cert option for that transfer to prevent exactly this. (CVE-2026-86415)

  - When using ambient user credentials, an HTTP request directed to one origin may be     dispatched over a connection previously authenticated via Negotiate for a different origin,     leaving the request's intended credentials unused. (CVE-2026-87861)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - libcurl's connection cache match function never considers the automatic client certificate option, so a     cached, already authenticated Schannel connection can be handed to a transfer that got redirected to a     different origin, even though the code explicitly switched off the auto client cert option for that     transfer to prevent exactly this. (CVE-2026-86415)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 14dab969-c797-11f1-a6ea-8447094a420f advisory.

    The Curl project reports:

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
379442	GLSA-202611-07 : curl: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	Local	medium
477458	Alpine: libcurl, multiple curl packages: security update to 8.23.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
477458	Alpine: libcurl, multiple curl packages: security update to 8.23.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
371159	Curl 8.21.0 < 8.23.0 Multiple Connection Reuse Vulnerabilities	Nessus	Misc.	Local	critical
365730	Linux Distros Unpatched Vulnerability : CVE-2026-86415	Nessus	Misc.	Local	high
365567	FreeBSD : Curl -- Multiple vulnerabilities (14dab969-c797-11f1-a6ea-8447094a420f)	Nessus	FreeBSD Local Security Checks	Local	critical

Detections

Analytics

CVE-2026-86415

high

Tenable Plugins

medium

critical

critical

critical

high

critical