CVE-2026-33247 | nats-io nats-server up to 2.11.14/2.12.5 /debug/vars insertion of sensitive information into debugging code (GHSA-x6g4-f6q3-fqvv)

VDB-353500 · CVE-2026-33247 · GHSA-X6G4-F6Q3-FQVV NATS-IO NATS-SERVER UP TO 2.11.14/2.12.5 /DEBUG/VARS INSERTION OF SENSITIVE INFORMATION INTO DEBUGGING CODE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.1 $0-$5k 2.28+ Summaryinfo A vulnerability classified as problematic was found in nats-io nats-server up to 2.11.14/2.12.5. This issue affects some unknown processing of the file /debug/vars. Executing a manipulation can lead to insertion of sensitive information into debugging code. This vulnerability is registered as CVE-2026-33247. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised. Detailsinfo A vulnerability was found in nats-io nats-server up to 2.11.14/2.12.5. It has been declared as problematic. This vulnerability affects an unknown function of the file /debug/vars. The manipulation with an unknown input leads to a insertion of sensitive information into debugging code vulnerability. The CWE definition for the vulnerability is CWE-215. The product inserts sensitive information into debugging code, which could expose this information if the debugging code is not disabled in production. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes: NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-33247 since 03/18/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592. Upgrading to version 2.11.15 or 2.12.6 eliminates this vulnerability. Productinfo Vendor nats-io Name nats-server Version 2.11.0 2.11.1 2.11.2 2.11.3 2.11.4 2.11.5 2.11.6 2.11.7 2.11.8 2.11.9 2.11.10 2.11.11 2.11.12 2.11.13 2.11.14 2.12.0 2.12.1 2.12.2 2.12.3 2.12.4 2.12.5 Website Product: https://github.com/nats-io/nats-server/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.2 VulDB Meta Temp Score: 6.1 VulDB Base Score: 5.0 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.4 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Insertion of sensitive information into debugging code CWE: CWE-215 / CWE-200 / CWE-284 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: nats-server 2.11.15/2.12.6 Timelineinfo 03/18/2026 CVE reserved 03/25/2026 +7 days Advisory disclosed 03/25/2026 +0 days VulDB entry created 03/25/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-x6g4-f6q3-fqvv Status: Confirmed CVE: CVE-2026-33247 (🔒) GCVE (CVE): GCVE-0-2026-33247 GCVE (VulDB): GCVE-100-353500 Entryinfo Created: 03/25/2026 23:00 Changes: 03/25/2026 23:00 (64) Complete: 🔍 Cache ID: 99:DD5:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸