FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, division by zero in MS-ADPCM and IMA-ADPCM decoders when nBlockAlign is 0, leading to a crash. In libfreerdp/codec/dsp.c, both ADPCM decoders use size % block_size where block_size = context->common.format.nBlockAlign. The nBlockAlign value comes from the Server Audio Formats PDU on the RDPSND channel. The value 0 is not validated anywhere before reaching the decoder. When nBlockAlign = 0, the modulo operation causes a SIGFPE (floating point exception) crash. This vulnerability is fixed in 3.24.0.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade freerdpUpgrade libwinpr-develUpgrade libwinprUpgrade freerdp-libsUpgrade freerdp-devel | May 12, 2026 | May 11, 2026 |
| Alpine Linux | — | Upgrade freerdp | Mar 16, 2026 | Mar 13, 2026 |
| Amazon Linux Ami 2 | — | Upgrade freerdpUpgrade freerdp-debuginfoUpgrade libwinpr-develUpgrade freerdp-develUpgrade freerdp-libsUpgrade libwinpr | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade freerdp-libs-debuginfoUpgrade freerdp-libsUpgrade freerdp-develUpgrade freerdp-serverUpgrade freerdp-server-debuginfoUpgrade libwinpr-debuginfoUpgrade libwinprUpgrade freerdpUpgrade freerdp-debugsourceUpgrade freerdp-debuginfoUpgrade libwinpr-devel | Apr 7, 2026 | Mar 13, 2026 |
| Debian | — | Upgrade freerdp3 | Jul 23, 2026 | Jul 23, 2026 |
| Oracle_linux | — | Upgrade freerdp-libsUpgrade freerdp-serverUpgrade freerdp-develUpgrade freerdpUpgrade libwinprUpgrade libwinpr-devel | May 13, 2026 | Mar 13, 2026 |
| Redhat_linux | — | Upgrade libwinpr-develUpgrade freerdp-debuginfoUpgrade freerdp-develUpgrade freerdp-serverUpgrade freerdp-debugsourceUpgrade freerdp-libsUpgrade freerdp-libs-debuginfoUpgrade libwinpr-debuginfoUpgrade libwinprNo solution existsUpgrade freerdpUpgrade freerdp-server-debuginfo | May 12, 2026 | Mar 13, 2026 |
| Rocky_linux | — | Upgrade freerdp-libs-debuginfoUpgrade freerdp-serverUpgrade freerdp-develUpgrade libwinprUpgrade libwinpr-debuginfoUpgrade freerdp-libsUpgrade freerdp-server-debuginfoUpgrade libwinpr-develUpgrade freerdp-debuginfoUpgrade freerdpUpgrade freerdp-debugsource | May 14, 2026 | May 13, 2026 |
| Ubuntu | — | Upgrade freerdp-x11Upgrade freerdp3-x11Upgrade libfreerdp3-3 | Jul 21, 2026 | Jul 20, 2026 |
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