by Kastro
Paper/Archive/CVE-2026-49252

CVE-2026-49252

deepstreamIO deepstream.io — deepstream is vulnerable to prototype pollution

EPSS 0.5%CVSS 9.9
critical.is priorityof 100
38
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 40.7.407 × 208.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
deepstream.io< 10.0.5–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/deepstreamIO/deepstream.io/security/advisories/GHSA-9v98-6g37-x9g6refgithub.com/deepstreamIO/deepstream.io/commit/54b8e2958a98df444b5b5d9a66e22872afd84e44