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CVE-2026-58214
4.3 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): Low (L)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): Low (L)
- Integrity (I): None (N)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): Low (L)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): Low (L)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): None (N)
Activity log
- Created suggestion
NATS Server: MQTT subscribe ACL bypass via $MQTT.deliver.pubrel prefix (incomplete fix for CVE-2026-33217)
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.
References
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https://github.com/nats-io/nats-server/security/advisories/GHSA-4g68-3pwx-5vfj x_refsource_CONFIRM
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https://github.com/nats-io/nats-server/releases/tag/v2.12.12 x_refsource_MISC
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https://github.com/nats-io/nats-server/releases/tag/v2.14.3 x_refsource_MISC
Affected products
nats-server
- ==>= 2.14.0-RC.1, < 2.14.3
- ==< 2.12.12
Package maintainers
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@derekcollison Derek Collison <derek@nats.io>
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@swdunlop Scott W. Dunlop <swdunlop@gmail.com>