CVE-2026-115390: Uncontrolled Resource Consumption in bytecodealliance wasmtime
Description
CVE-2026-115390 is a medium severity vulnerability in bytecodealliance's wasmtime affecting versions 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1. It involves a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths that allows malicious guests to reset consumed fuel, enabling them to run exponentially longer than intended and evade timeouts and periodic yields. This can lead to denial of service conditions.
CVSS v4.0
Score 6.9medium
Affected software
bytecodealliance
wasmtime
pkg:cargo/github/bytecodealliance/wasmtimeRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Wasmtime versions 47.0.0 prior to 48.0.3 and 49.0.0 prior to 49.0.1 contain a vulnerability in the fuel accounting mechanism within Cranelift-compiled call_ref and try_table catch paths. Specifically, malicious guest code can reset the consumed fuel counter after calls, allowing execution to continue far beyond intended limits on linear fuel. This flaw enables evasion of timeouts and periodic yields, potentially causing denial of service by exhausting resources.
Potential Impact
The vulnerability allows attackers running malicious guest code to bypass execution time limits by resetting fuel consumption counters, leading to prolonged execution and resource exhaustion. This can cause denial of service conditions on the host running wasmtime, impacting availability.
Mitigation Recommendations
A fix is available in wasmtime versions 48.0.3 and 49.0.1. Users should upgrade to these or later versions to remediate the vulnerability. No other mitigation guidance is provided.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-22T11:27:18.001Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ada64a54d27ba8daa756589
Added to database: 10/22/2026, 19:31:49 UTC
Last enriched: 10/22/2026, 20:30:59 UTC
Last updated: 10/22/2026, 21:15:17 UTC
Views: 3
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