CVE-2026-119133
Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a memory misalignment flaw in VMContext layout that causes undefined behavior when modules contain an odd number of exception tags. A WebAssembly module with an odd tag count misaligns subsequent host fields in embedders with exceptions enabled, although no exploitation path is currently known.
- Score
- 2.1 low
- Published
- 2026-10-29
- Links
- NVD · cve.org · Report wrong data
Matched ports (1)
| Port | Package | Version | Status | Maintainer |
|---|---|---|---|---|
| devel/libwasmtime | libwasmtime | 49.0.2_1 | unaddressed | longros@FreeBSD.org |
Template for a VuXML entry
Check the version numbers before you commit this entry. Some ports share an entry in the CVE database with another port, such as sqlite2 and sqlite3. The version shown here may then be one that never existed for this port.
Ranges per package from the CVE rows that match this port, in pkg notation with the port's epoch and revision, every bound checked with pkg; one range per epoch the port actually had. make newentry in security/vuxml creates the vid.
<vuln vid="FIXME (make newentry)">
<topic>libwasmtime -- FIXME</topic>
<affects>
<package>
<name>libwasmtime</name>
<!-- 49.0.3 is not released yet, newest upstream is 49.0.2 -->
<range><ge>49.0.0</ge><lt>49.0.3</lt></range>
</package>
</affects>
<description>
<body xmlns="http://www.w3.org/1999/xhtml">
<p>CVE-2026-119133: Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before
49.0.3 contains a memory misalignment flaw in VMContext layout that
causes undefined behavior when modules contain an odd number of
exception tags. A WebAssembly module with an odd tag count
misaligns subsequent host fields in embedders with exceptions
enabled, although no exploitation path is currently known.</p>
</body>
</description>
<references>
<cvename>CVE-2026-119133</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-119133</url>
</references>
<dates>
<discovery>2026-10-29</discovery>
<entry>2026-10-29</entry>
</dates>
</vuln>