CVE-2026-5536FedML-AI FedML gRPC server grpc_server.py sendMessage deserialization

6.9MediumCVSS base score
0.38%Exploitation in 30 daysEPSS · top 67% of all CVEs
NoKnown exploitednot in CISA's KEV catalog
NonePublic exploitsnone known yet

Description

A weakness has been identified in FedML-AI FedML up to 0.8.9. Affected is the function sendMessage of the file grpc_server.py of the component gRPC server. Executing a manipulation can lead to deserialization. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.

Timeline

2026
4 Apr 2026
4 Apr 2026
ID reserved
By VulDB
5 Apr 20261 day later
5 Apr 2026· 1 day later
Published
6 Apr 20261 day later
6 Apr 2026· 1 day later
Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-5536, by who scored it
Scored by	CVSS	Score	Vector
VulDBCNA (assigner)	4.0	Medium6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
VulDBCNA (assigner)	3.1	High7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R
VulDBCNA (assigner)	3.0	High7.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R
VulDBCNA (assigner)	2.0	High7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:ND/RC:UR
NVDNVD · Analyzed	4.0	Medium6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS (exploitation in 30 days): 0.38% · top 67% of all CVEs (14 Nov 2026)
CISA SSVC: Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.9.

Affected products

FedML-AI · FedML
- affected 0.8.0
- affected 0.8.1
- affected 0.8.2
- affected 0.8.3
- affected 0.8.4
- affected 0.8.5
- affected 0.8.6
- affected 0.8.7
- affected 0.8.8
- affected 0.8.9

References4

VDB-355289 | FedML-AI FedML gRPC server grpc_server.py sendMessage deserialization (opens in a new tab)vdb-entrytechnical-description
VDB-355289 | CTI Indicators (IOB, IOC, IOA) (opens in a new tab)signaturepermissions-required
Submit #782201 | FedML-AI FedML <= 0.8.9 Remote Code Execution (opens in a new tab)third-party-advisory
https://github.com/AnalogyC0de/public_exp/issues/26 (opens in a new tab)issue-tracking

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

[![CVE-2026-5536](https://cveledger.app/badge/CVE-2026-5536.svg)](https://cveledger.app/cve/CVE-2026-5536)

Record last updated 6 Apr 2026, 14:51 UTC.