CVE-2026-115845
Incomplete validation in the run_script Python sandbox in AWS MCP Server
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CVSS v3.1 (listed by NVD)
6.4
MEDIUM
Scored by AMZN (not yet scored by NVD)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0 (listed by NVD)
5.3
MEDIUM
Scored by AMZN (not yet scored by NVD)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS (listed by CVE.org)
5.3
MEDIUM
Scored by CNA (AMZN) · v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS exploit probability
0.4%
Percentile 30.9%
as of 2026-10-24
CISA KEV
—
Not listed
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vector
NetworkLoginNo interaction
Scope change
Confidentiality LIntegrity LAvailability N
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | L | Regular user |
| User interaction UI | N | None |
| Scope S | C | Changed (affects other components) |
| Confidentiality C | L | Low |
| Integrity I | L | Low |
| Availability A | N | None |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Description
NVD
An incomplete list of disallowed inputs in the Python code validator of the run_script tool in AWS MCP Server might allow an authenticated remote user to execute arbitrary code within their own isolated session environment via a crafted script. AWS fixed this issue service-side. No customer action is required.
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / ff89ba41-3aa1-4d27-914a-91399e9639e5 (Secondary) | 4.0 | 5.3 MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD / ff89ba41-3aa1-4d27-914a-91399e9639e5 (Secondary) | 3.1 | 6.4 MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| CNA / AMZN | 3.1 | 6.4 MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| CNA / AMZN | 4.0 | 5.3 MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| AWS | AWS MCP Server | affected: N/A default: unaffected |
Linux distribution status
References (1)
- https://aws.amazon.com/security/security-bulletins/2026-149-aws/ NVD, CNA vendor-advisory