CVE-2020-36406
uWebSockets 18.11.0 and 18.12.0 has a stack-based buffer overflow in uWS::TopicTree::trimTree (called from uWS::TopicTree::unsubscribeAll).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
uWebSockets 18.11.0 and 18.12.0 has a stack-based buffer overflow in uWS::TopicTree::trimTree (called from uWS::TopicTree::unsubscribeAll). NOTE: the vendor's position is that this is "a minor issue or not even an issue at all" because the developer of an application (that uses uWebSockets) should not be allowing the large number of triggered topics to accumulate
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 1.52% probability · 74th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- uwebsockets project/uwebsockets
- Source
- cve@mitre.org
EPSS 1.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25381Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/uwebsockets/OSV-2020-1695.yamlThird Party Advisory
- https://github.com/uNetworking/uWebSockets/commit/03fca626a95130ab80f86adada54b29d27242759Patch, Third Party Advisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25381Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/uwebsockets/OSV-2020-1695.yamlThird Party Advisory
- https://github.com/uNetworking/uWebSockets/commit/03fca626a95130ab80f86adada54b29d27242759Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.