CVE catalog

CVE-2026-21726

The CVE-2021-36156 fix validates the namespace parameter for path traversal sequences after a single URL decode, by double encoding, an attacker can read files at the Ruler API endpoint /loki/api/v1/r

[CVE catalog]

Severity
Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
Source
[NVD] · [CVE record]
EPSS
0.41% · Oct 27, 2026

A flaw was found in Loki. A remote attacker can exploit a path traversal vulnerability by using double encoding on the namespace parameter after a single URL decode. This allows the attacker to read arbitrary files at the Ruler API endpoint, leading to information disclosure. Loki: Loki: Information disclosure via path traversal vulnerability The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
CpelokiNot reported3.6.4fixed
CpelokiNot reported3.6.4fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
CpelokicpeNot reported3.6.4Not reportedNot reportedNot reported
CpelokicpeNot reported3.6.4Not reportedNVD-CVE-2026-21726Not reported

OpenFactory catalog packages

No matching packages in this catalog.

Observed:

References

[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX]