Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process. This issue has been patched in versions 3.5.3 and 3.11.3.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ebaf2bfd71 advisory.

    Update to 3.12.0

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 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-dfc0e362e6 advisory.

    Update to 3.12.0

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

  - Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and     3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-     compressed request body before allocating memory. An unauthenticated attacker can send a small payload     that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory     and crash the Prometheus process. This issue has been patched in versions 3.5.3 and 3.11.3.
    (CVE-2026-42154)

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

ID	Name	Product	Family	Severity
322124	Fedora 44 : prometheus (2026-ebaf2bfd71)	Nessus	Fedora Local Security Checks	low
322122	Fedora 43 : prometheus (2026-dfc0e362e6)	Nessus	Fedora Local Security Checks	low
312612	Linux Distros Unpatched Vulnerability : CVE-2026-42154	Nessus	Misc.	high

Detections

Analytics

CVE-2026-42154

high

Tenable Plugins

low

low

high