CVE-2026-49252

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

deepstream 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.

CVSS v3
9.9
EG Score
9.9(medium)
EPSS
18.7%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Jul 1, 2026
Patch available. Sources: github_commit, github.
github Patch Available

prototype pollution · Advisory · deepstreamIO/deepstream.io · GitHub

https://github.com/deepstreamIO/deepstream.io/security/advisories/GHSA-9v98-6g37-x9g6
github_commit

commit 54b8e2958a98 (deepstreamIO/deepstream.io)

Fix landed in deepstreamIO/deepstream.io commit 54b8e2958a98 — awaiting tagged release

https://github.com/deepstreamIO/deepstream.io/commit/54b8e2958a98df444b5b5d9a66e22872afd84e44

Vendor Advisories for CVE-2026-49252(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 47× in last 7d / 125× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 125 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2026-49252?
CVE-2026-49252 is a critical vulnerability published on June 18, 2026. deepstream 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…
When was CVE-2026-49252 disclosed?
CVE-2026-49252 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49252 actively exploited?
CVE-2026-49252 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49252?
CVE-2026-49252 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-49252?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49252, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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