CVE-2026-49252 is a critical-severity security vulnerability in @deepstream/server (npm), affecting versions < 10.0.5. It is fixed in 10.0.5.
Impact Prototype pollution in deepstream server v <=10.0.4. Potential privilege escalation from any authenticated user with write permission to any record. Patches Yes, upgrade to v10.0.5 Workarounds Filter out all messages containing the path proto, constructor, prototype, before they reach the server's message pipeline
CVE-2026-49252 has a CVSS score of 9.9 (Critical). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (10.0.5). Upgrading removes the vulnerable code path.
npm
@deepstream/server (< 10.0.5)@deepstream/server → 10.0.5 (npm)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-49252 is reachable in your applications. Explore open-source security for your team.
See if CVE-2026-49252 is reachable in your applications. Get a demo
Already deployed Kodem? See CVE-2026-49252 in your environment →Upgrade @deepstream/server to 10.0.5 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-49252 is a critical-severity security vulnerability in @deepstream/server (npm), affecting versions < 10.0.5. It is fixed in 10.0.5.
CVE-2026-49252 has a CVSS score of 9.9 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
@deepstream/server (npm) versions < 10.0.5 is affected.
Yes. CVE-2026-49252 is fixed in 10.0.5. Upgrade to this version or later.
Whether CVE-2026-49252 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade @deepstream/server to 10.0.5 or later.