CVE-2026-49252
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · unediteddeepstream is a server that allows clients and backend services to sync data, send messages and make rpcs at scale. Versions prior to 10.0.5 are vulnerable to Prototype Pollution. Exploitation can lead to potential privilege escalation from any authenticated user with write permission to any record. This issue has been fixed in version 10.0.5.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidencedeepstream versions prior to 10.0.5 contain a Prototype Pollution vulnerability that allows any authenticated user with write permission to manipulate JavaScript object prototypes, potentially leading to privilege escalation across records.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm deepstream is present in your environmentCheck for running deepstream processes or installed packages (e.g., look for deepstream in process list, package.json dependencies, or node_modules)Affected if deepstream software is found running or installed
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Identify the installed deepstream versionRun the deepstream version command, check package.json/package-lock.json version field, or query the running instance's /info endpoint if exposedAffected if the version is lower than 10.0.5 (e.g., 10.0.4, 10.0.0, 9.x.x, etc.)
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Verify if authentication is enabledInspect deepstream configuration files (typically conf/config.yml or similar) for auth settings under the auth sectionAffected if authentication is configured and users can log in
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Check if write permissions are granted to authenticated usersReview permission definitions in your permission file (often permissions.yml or permission rules in config) for write access on recordsAffected if any authenticated user role or user has write permission (write: true) on records or wildcards like 'record/*'
You are affected if deepstream is running with a version below 10.0.5 AND authentication is enabled AND write permissions are granted to at least one authenticated user role on records.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade deepstream to version 10.0.5 or later to patch the Prototype Pollution vulnerability. Verify upgrade in staging before production deployment.
10.0.5
- Identify the current deepstream server version in use (check package.json, Dockerfile, or running service)
- Stop the deepstream service
- Update deepstream dependency to version 10.0.5 (e.g., npm install [email protected] or equivalent for your package manager)
- Verify the new version is installed correctly
- Restart the deepstream service
- Confirm the service is running without errors
- Test that authenticated users can still access records normally
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,552.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-49252 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-49252 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data