libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds
CVE-2026-3731 is fixed in 7 products on 1 platform, first by libssh-4 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7, released March 8, 2026. It is not reported as exploited. Patch Radar priority: High.
A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libssh · Debian 12.15 (bookworm) | 0.10.6-0+deb12u3 | DEBIAN-CVE-2026-3731 | Mar 8, 2026 |
| libssh · Debian 13.5 (trixie) | 0.11.5-0+deb13u1 | DEBIAN-CVE-2026-3731 | Mar 8, 2026 |
| libssh · Debian 14 | 0.12.0-1 | DEBIAN-CVE-2026-3731 | Mar 8, 2026 |
| libssh · amzn 2023 | 0.10.6-1.amzn2023.0.7 | ALAS2023-2026-1759 | May 25, 2026 |
| libssh · opensuse-leap 15.6 | 0.9.8-150600.11.12.1 | SUSE-SU-2026:1310-1 | Apr 14, 2026 |
| libssh · sles 15.7 | 0.9.8-150600.11.12.1 | SUSE-SU-2026:1310-1 | Apr 14, 2026 |
| libssh-4 · Ubuntu 18.04.6 LTS (bionic) | 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7 | libssh-4 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7 | Mar 8, 2026 |
| libssh-4 · Ubuntu 20.04 LTS (focal) | 0.9.3-2ubuntu2.5+esm4 | libssh-4 0.9.3-2ubuntu2.5+esm4 | Mar 8, 2026 |
| libssh-4 · Ubuntu 22.04.1 LTS (jammy) | 0.9.6-2ubuntu0.22.04.7 | libssh-4 0.9.6-2ubuntu0.22.04.7 | Mar 8, 2026 |
| libssh-4 · Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.4 | libssh-4 0.10.6-2ubuntu0.4 | Mar 8, 2026 |
| libssh-4 · Ubuntu 25.10 (questing) | 0.11.2-1ubuntu0.3 | libssh-4 0.11.2-1ubuntu0.3 | Mar 8, 2026 |
| libssh-4 · Ubuntu 26.04.1 LTS (resolute) | 0.11.3-1ubuntu2 | libssh-4 0.11.3-1ubuntu2 | Mar 8, 2026 |
| libssh-config · amzn 2023 | 0.10.6-1.amzn2023.0.7 | ALAS2023-2026-1759 | May 25, 2026 |
| libssh-debuginfo · amzn 2023 | 0.10.6-1.amzn2023.0.7 | ALAS2023-2026-1759 | May 25, 2026 |
| libssh-debugsource · amzn 2023 | 0.10.6-1.amzn2023.0.7 | ALAS2023-2026-1759 | May 25, 2026 |
| libssh-devel · amzn 2023 | 0.10.6-1.amzn2023.0.7 | ALAS2023-2026-1759 | May 25, 2026 |
| libssh-gcrypt-4 · Ubuntu 18.04.6 LTS (bionic) | 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7 | libssh-gcrypt-4 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7 | Mar 8, 2026 |
| libssh-gcrypt-4 · Ubuntu 20.04 LTS (focal) | 0.9.3-2ubuntu2.5+esm4 | libssh-gcrypt-4 0.9.3-2ubuntu2.5+esm4 | Mar 8, 2026 |
| libssh-gcrypt-4 · Ubuntu 22.04.1 LTS (jammy) | 0.9.6-2ubuntu0.22.04.7 | libssh-gcrypt-4 0.9.6-2ubuntu0.22.04.7 | Mar 8, 2026 |
| libssh-gcrypt-4 · Ubuntu 24.04.5 LTS (noble) | 0.10.6-2ubuntu0.4 | libssh-gcrypt-4 0.10.6-2ubuntu0.4 | Mar 8, 2026 |
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