In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows an attacker to recover the plaintext when PKCS#7 padding mode is used.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-29f4f47ade advisory.

    Update to 1.28.0

Tenable has extracted the preceding description block directly from the Fedora 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 remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-d619d8d077 advisory.

    Automatic update for micropython-1.28.0-1.fc45.

    ##### **Changelog**

    ```
    * Mon Apr  6 2026 Lumr Balhar <lbalhar@redhat.com> - 1.28.0-1
    - Update to 1.28.0
    - Security fix for CVE-2026-1998
    - Update mbedtls submodule to 3.6.6
    - mbedtls security fixes for CVE-2026-25834, CVE-2026-34871, CVE-2026-25833
    - CVE-2025-52496, CVE-2025-52497, CVE-2025-49087, CVE-2025-54764, CVE-2025-59438      Resolves: rhbz#2455368, rhbz#2376688, rhbz#2376701, rhbz#2382261, rhbz#2405245,      rhbz#2405374, rhbz#2437327, rhbz#2454032, rhbz#2454086, rhbz#2454213

    ```

Tenable has extracted the preceding description block directly from the Fedora 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In Mbed TLS 3.6.1 through 3.6.3 before 3.6.4, a timing discrepancy in block cipher padding removal allows     an attacker to recover the plaintext when PKCS#7 padding mode is used. (CVE-2025-49087)

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

ID	Name	Product	Family	Severity
306614	Fedora 43 : micropython (2026-29f4f47ade)	Nessus	Fedora Local Security Checks	medium
306036	Fedora 45 : micropython (2026-d619d8d077)	Nessus	Fedora Local Security Checks	medium
248808	Linux Distros Unpatched Vulnerability : CVE-2025-49087	Nessus	Misc.	low

Detections

Analytics

CVE-2025-49087

low

Tenable Plugins

medium

medium

low