The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8227-1 advisory.

    It was discovered that curl incorrectly reused non-TLS connections when TLS was required in some STARTTLS     configurations. A remote attacker could possibly use this issue to obtain sensitive information.
    (CVE-2026-4873)

    It was discovered that curl incorrectly reused certain HTTP Negotiate connections. A remote attacker could     possibly use this issue to obtain sensitive information. (CVE-2026-5545)

    It was discovered that curl incorrectly reused certain SMB connections. A remote attacker could possibly     use this issue to obtain sensitive information. (CVE-2026-5773)

    It was discovered that curl could leak proxy credentials when handling redirects in some configurations. A     remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-6253)

    It was discovered that curl could leak cookies because of stale custom cookie host handling in some     requests. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-6276)

    It was discovered that curl could leak .netrc credentials when reusing proxy connections in some     situations. A remote attacker could possibly use this issue to obtain sensitive information.
    (CVE-2026-6429)

    It was discovered that curl could leak Digest authentication state when switching proxies in some     situations. A remote attacker could possibly use this issue to obtain sensitive information.
    (CVE-2026-7168)

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

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

An update of the curl package has been released.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1717-1 advisory.

    Security issues fixed:

    - CVE-2026-4873: connection reuse ignores TLS requirement (bsc#1262631).
    - CVE-2026-5545: wrong reuse of HTTP Negotiate connection (bsc#1262632).
    - CVE-2026-6253: proxy credentials leak over redirect-to proxy (bsc#1262635).
    - CVE-2026-6276: stale custom cookie host causes cookie leak (bsc#1262636).
    - CVE-2026-6429: netrc credential leak with reused proxy connection (bsc#1262638).

    Other updates and bugfixes:

    - sws: prevent 'connection monitor' to say disconnect twice (bsc#1259362).

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

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

The version of libcurl installed on the remote host is 7.14.0 prior to 8.20.0. It is, therefore, affected by a netrc password leak vulnerability:

  - When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak     the password used for the first host to the followed-to host under certain circumstances. The issue     requires that both the original and redirect destinations use unencrypted http:// URLs, both requests     traverse an identical HTTP proxy, and the connection between client and proxy gets reused.
    (CVE-2026-6429)

Note that Nessus has not tested for this issue 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.

  - Debian Linux - curl - None  Red Hat Enterprise Linux - curl: libcurl: Credential leak via reused proxy     connection during HTTP redirects  Ubuntu Linux - When asked to both use a `.netrc` file for credentials     and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to     host under certain circumstances. Similar to CVE-2024-11053. (CVE-2026-6429)

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

ID	Name	Product	Family	Published	Updated	Severity
312298	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : curl vulnerabilities (USN-8227-1)	Nessus	Ubuntu Local Security Checks	5/5/2026	5/5/2026	high
313011	Photon OS 4.0: Curl PHSA-2026-4.0-1007	Nessus	PhotonOS Local Security Checks	5/7/2026	5/7/2026	high
313680	SUSE SLED15 / SLES15 Security Update : curl (SUSE-SU-2026:1717-1)	Nessus	SuSE Local Security Checks	5/10/2026	5/10/2026	medium
311421	libcurl 7.14.0 < 8.20.0 Netrc Password Leak on HTTP Redirect	Nessus	Misc.	5/1/2026	5/4/2026	high
313013	Photon OS 5.0: Curl PHSA-2026-5.0-0838	Nessus	PhotonOS Local Security Checks	5/7/2026	5/7/2026	high
310988	Linux Distros Unpatched Vulnerability : CVE-2026-6429	Nessus	Misc.	4/29/2026	5/5/2026	high

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