Detections
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Linux Distros Unpatched Vulnerability : CVE-2026-48791

low Nessus Plugin ID 335296

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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.

 - sigstore-java is a sigstore java client for interacting with sigstore infrastructure. Version 2.0.0 erroneously removed verification of the integrated (Rekor entry) time) against the Fulcio certificate.
 Version 2.1.0 re-added this verification with enhancements that adhere to the Sigstore verification spec.
 The old sigstore-conformance test for this check was built incorrectly. This vulnerability impacts only users verifying bundles with `dev.sigstore:sigstore-java:2.0.0`. Older versions are not affected; it is fixed in `dev.sigstore:sigstore-java:2.1.0` A malicious actor may exploit this if they were able to access a users system and exfiltrate the temporary private key used during signing and then reuse an old fulcio certificate later without requiring direct access to the user's credentials. Users may protect themselves by re-verifying their artifacts using the newest sigstore-java or another current sigstore client.
 Transparency logs may also be audited for unauthorized signatures for a suspected reused identity.
 (CVE-2026-48791)

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://ubuntu.com/security/CVE-2026-48791

Plugin Details

Severity: Low

ID: 335296

File Name: unpatched_CVE_2026_48791.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Misc.

Published: 8/13/2026

Updated: 8/17/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Low

Base Score: 1.4

Temporal Score: 1.2

Vector: CVSS2#AV:L/AC:L/Au:M/C:N/I:P/A:N

CVSS Score Source: CVE-2026-48791

CVSS v3

Risk Factor: Low

Base Score: 2

Temporal Score: 1.9

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:golang-github-sigstore-sigstore

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 6/30/2026

Reference Information

CVE: CVE-2026-48791