Bug 2559361 (CVE-2026-115391) - CVE-2026-115391 wasmtime: wasmtime: Denial of Service via unbounded buffering in WASIp3 write streams
Summary: CVE-2026-115391 wasmtime: wasmtime: Denial of Service via unbounded buffering...
Keywords:
Status: NEW
Alias: CVE-2026-115391
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-22 20:52 UTC by OSIDB Bzimport
Modified: 2026-10-23 14:29 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-10-22 20:52:55 UTC 
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.
Note You need to log in before you can comment on or make changes to this bug.