Detections
Analytics

SCA: security update for lemur (GHSA-v5rc-cpwc-cfpr)

high Tenable Cloud Security Plugin ID 446086

Description

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

 - Lemur manages TLS certificate creation. Prior to 1.9.3, _validate_acme_url enforced
 ACME_DIRECTORY_HOST_ALLOWLIST when an authority was created, but PUT /api/1/authorities/ passed options to
 lemur/authorities/service.py without applying the same check. A user holding an authority role could
 replace the stored acme_url with an internal service or instance-metadata URL such as 169.254.169.254. The
 next issuance operation loaded that value and passed it to ClientV2.get_directory, causing an outbound
 request from the Lemur backend. This bypassed the creation-time mitigation for CVE-2026-55166 and could
 expose internal services or cloud metadata. The fix revalidates acme_url whenever authority options are
 updated. This issue is fixed in version 1.9.3. (CVE-2026-71303)

Solution

Update the lemur library and its related packages to version 1.9.3 or later.

See Also

https://github.com/advisories/GHSA-v5rc-cpwc-cfpr

Plugin Details

Severity: High

ID: 446086

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/19/2026

Updated: 8/19/2026

Risk Information

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-71303

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.7

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/18/2026

Vulnerability Publication Date: 8/18/2026

Reference Information

CVE: CVE-2026-71303

cwe: CWE-918