It's possible for a gRPC client communicating with a HTTP/2 proxy to poison the HPACK table between the proxy and the backend such that other clients see failed requests. It's also possible to use this vulnerability to leak other clients HTTP header keys, but not values.
This occurs because the error status for a misencoded header is not cleared between header reads, resulting in subsequent (incrementally indexed) added headers in the first request being poisoned until cleared from the HPACK table.
Please update to a fixed version of gRPC as soon as possible. This bug has been fixed in 1.58.3, 1.59.5, 1.60.2, 1.61.3, 1.62.3, 1.63.2, 1.64.3, 1.65.4.
CVSS Details
- CVSS 4.0 Base Score: 6.3 (MEDIUM)
- CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/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)
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade grpc-debuginfoUpgrade grpc-develUpgrade grpc-dataUpgrade grpcUpgrade grpc-cppUpgrade grpc-plugins-debuginfoUpgrade grpc-cpp-debuginfoUpgrade grpc-docUpgrade grpc-debugsourceUpgrade grpc-plugins | Feb 17, 2025 | Aug 6, 2024 |
| Debian | — | No solution exists | May 15, 2025 | Aug 6, 2024 |
| Splunk | — | Upgrade Splunk Enterprise to version 10.0.4Upgrade Splunk Enterprise to version 10.2.1Upgrade Splunk Enterprise to version 9.3.10Upgrade Splunk Enterprise to version 9.4.9 | Mar 20, 2026 | Aug 6, 2024 |
| Suse | — | Upgrade libgrpc++1_59Upgrade libgrpc1_59Upgrade libgrpc1_60Upgrade grpc-develUpgrade libupb37Upgrade libupb36Upgrade libgrpc++1_60Upgrade libgrpc36Upgrade grpc-sourceUpgrade upb-develUpgrade python311-grpcioUpgrade libgrpc37 | Dec 30, 2024 | Aug 6, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Aug 6, 2024 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub