SCA: security update for lemur (GHSA-54vg-pfh7-jq95)

medium Tenable Cloud Security Plugin ID 443982

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- Lemur manages TLS certificate creation. Prior to 1.9.2, lemur/certificates/verify.py accepted CRL
Distribution Point and OCSP responder URLs from uploaded certificate extensions and used them in
crl_verify and ocsp_verify without adequate destination validation. An authenticated operator could submit
a certificate through POST /api/1/certificates/upload and cause verify_string to reach loopback, RFC1918,
link-local, or instance-metadata destinations such as 169.254.169.254. The requests could probe internal
services and create side effects from the Lemur host network position. The CRL path also used an unbounded
cache, allowing attacker-controlled entries to persist and consume memory. The fix validates destinations,
supports explicit trusted-host allowlists, and bounds the CRL cache. This issue is fixed in version 1.9.2.
(CVE-2026-55162)

Solution

Update the lemur library and its related packages to version 1.9.2 or later.

Plugin Details

Severity: Medium

ID: 443982

Version: Revision 1.4

Type: Local

Family: SCA Checks

Published: 6/26/2026

Updated: 8/19/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.8

Percentile: 22.52

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

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

CVSS Score Source: CVE-2026-55162

CVSS v3

Risk Factor: Medium

Base Score: 6.3

Temporal Score: 5.5

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/25/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-55162

cwe: CWE-918

Detections

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