Vulnerability details
CVE-2026-115384
bytecodealliance wasmtime
Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Stack Buffer Overflow
CVSS 4.0
9.4Critical
Official description
Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.4Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
| 9.9Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| bytecodealliance | wasmtime | 39.0.0 ≤ v < 48.0.4 | CVEProject cvelistV5 (CNA) |
| bytecodealliance | wasmtime | 49.0.0 ≤ v < 49.0.2 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-10-22
- Last updated
- 2026-10-29
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 20 · Low
Exploit prediction (EPSS)
0.31%
Probability of exploitation in 30 days
24.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-20Improper Input Validation