NATS Server: MQTT subscribe ACL bypass via $MQTT.deliver.pubrel prefix (incomplete fix for CVE-2026-33217) (nats-io nats-server)

CVE-2026-58214

MEDIUM 4.3

En bref

Source: NVD
EPSS: EPSS 0.35 % · centile 29 (2026-10-31)
État: PUBLISHED
Publiée: 2026-07-08 20:06 UTC
Mise à jour: 2026-07-09 13:32 UTC
Attribuée par: GitHub_M
Statut NVD: Analyzed

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Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an authenticated MQTT client could subscribe to the internal $MQTT.deliver.pubrel subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.

Faiblesses (CWE)

CWE-863 — Autorisation incorrecte

Références

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	MEDIUM 4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	GitHub_M
CVSS 3.1	MEDIUM 4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	NVD · security-advisories@github.com (Secondary)

Références européennes

ENISA EUVD · EUVD-2026-42387
GCVE · GCVE-0-2026-58214

Configurations affectées (CPE NVD)

cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* < 2.12.12
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* ≥ 2.14.0 < 2.14.3

Produits affectés

Produit	Versions
nats-io · nats-server	affected < 2.12.12 ; affected >= 2.14.0-RC.1, < 2.14.3

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

🟡 NATS Server: MQTT subscribe ACL bypass via $MQTT.deliver.pubrel prefix (incomplete fix for CVE-2026-33217) (nats-io nats-server)