CVE-2026-5536 | FedML-AI FedML up to 0.8.9 gRPC server grpc_server.py sendMessage deserialization

VDB-355289 · CVE-2026-5536 · GCVE-100-355289 FEDML-AI FEDML UP TO 0.8.9 GRPC SERVER GRPC_SERVER.PY SENDMESSAGE DESERIALIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.1 $0-$5k 1.68+ Summaryinfo A vulnerability marked as critical has been reported in FedML-AI FedML up to 0.8.9. Affected by this vulnerability is the function sendMessage of the file grpc_server.py of the component gRPC server. The manipulation leads to deserialization. This vulnerability is traded as CVE-2026-5536. It is possible to initiate the attack remotely. There is no exploit available. The vendor was contacted early about this disclosure but did not respond in any way. Detailsinfo A vulnerability was found in FedML-AI FedML up to 0.8.9 and classified as critical. This issue affects the function sendMessage of the file grpc_server.py of the component gRPC server. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-5536. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/04/2026). The vendor was contacted early about this disclosure but did not respond in any way. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Artificial Intelligence Software Vendor FedML-AI Name FedML Version 0.8.0 0.8.1 0.8.2 0.8.3 0.8.4 0.8.5 0.8.6 0.8.7 0.8.8 0.8.9 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.1 VulDB Base Score: 7.3 VulDB Temp Score: 7.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Deserialization CWE: CWE-502 / CWE-20 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/04/2026 Advisory disclosed 04/04/2026 +0 days VulDB entry created 04/04/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Not defined CVE: CVE-2026-5536 (🔒) GCVE (CVE): GCVE-0-2026-5536 GCVE (VulDB): GCVE-100-355289 Entryinfo Created: 04/04/2026 08:46 Changes: 04/04/2026 08:46 (54) Complete: 🔍 Submitter: Ana10gy Cache ID: 99:41A:101 Submitinfo Accepted Submit #782201: FedML-AI FedML <= 0.8.9 Remote Code Execution (by Ana10gy) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸