Medium severity · published Oct 22, 2026
CVE-2026-115390
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS
New
5.7
CVSS
0.2%
EPSS
No
On KEV
Description
Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 contains a fuel accounting flaw in Cranelift-compiled call_ref and try_table catch paths. Malicious guests can reset consumed fuel after calls to run exponentially long on linear fuel, evading timeouts and periodic yields for denial of service.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
wasmtime · bytecodealliance
47.0.0 before 48.0.3; 49.0.0 before 49.0.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115390
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115390
github.com
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m63x-6p34-q65x
www.vulncheck.com
https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.3-and-49.0.0-before-49.0.1-fuel-accounting-bypass-dos
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