Most recent entries from all https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 07 Oct 2026 12:31:50 +0000 CVE-2026-34945 — Wasmtime leaks host data with 64-bit tables and Winch https://vulnerability.circl.lu/vuln/cve-2026-34945 <p><strong>Affected:</strong> bytecodealliance wasmtime</p> <p>Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime&#39;s Winch compiler contains a bug where a 64-bit table, part of the memory64 proposal of WebAssembly, incorrectly translated the table.size instruction. This bug could lead to disclosing data on the host&#39;s stack to WebAssembly guests. The host&#39;s stack can possibly contain sensitive data related to other host-originating operations which is not intended to be disclosed to guests. This bug specifically arose from a mistake where the return value of table.size was statically typed as a 32-bit integer, as opposed to consulting the table&#39;s index type to see how large the returned register could be. When combined with details about Wnich&#39;s ABI, such as multi-value returns, this can be combined to read stack data from the host, within a guest. This vulnerability is fixed in 36.0.7, 42.0.2, and 43.0.1.</p> <p><strong>Affected:</strong> bytecodealliance wasmtime</p> <p>Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime&#39;s Winch compiler contains a bug where a 64-bit table, part of the memory64 proposal of WebAssembly, incorrectly translated the table.size instruction. This bug could lead to disclosing data on the host&#39;s stack to WebAssembly guests. The host&#39;s stack can possibly contain sensitive data related to other host-originating operations which is not intended to be disclosed to guests. This bug specifically arose from a mistake where the return value of table.size was statically typed as a 32-bit integer, as opposed to consulting the table&#39;s index type to see how large the returned register could be. When combined with details about Wnich&#39;s ABI, such as multi-value returns, this can be combined to read stack data from the host, within a guest. This vulnerability is fixed in 36.0.7, 42.0.2, and 43.0.1.</p> https://vulnerability.circl.lu/vuln/cve-2026-34945