CVE-2026-119140
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious components to panic the host via thread.yield in start functions. Attackers can supply a component whose start function calls an async-lowered import then thread.yield, causing an undisposed fiber drop that crashes embedders.
- Score
- 5.9 medium
- 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-2026-119140: Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before
49.0.3 contains a denial of service vulnerability that allows
malicious components to panic the host via thread.yield in start
functions. Attackers can supply a component whose start function
calls an async-lowered import then thread.yield, causing an
undisposed fiber drop that crashes embedders.</p>
</body>
</description>
<references>
<cvename>CVE-2026-119140</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-119140</url>
</references>
<dates>
<discovery>2026-10-29</discovery>
<entry>2026-10-29</entry>
</dates>
</vuln>