CVE-2026-5059VulnerabilityPublished 21 Apr 2026

ZDI-26-245: (0Day) aws-mcp-server AWS CLI Command Injection Remote Code Execution Vulnerability

Source Zero Day Initiative

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Not known to be exploited.

Data as of 30 Oct 2026, 11:52 UTC

Severity

Critical

Rated Critical by Zero Day Initiative · No CVSS score from NVD or the CNA

EPSS: 1.9% chance of exploitation in 30 days – higher than 79% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
Public on cve.org; its publication date is not in this record
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
Public exploit code: GitHub proofs of concept
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

remote

What to do

AI-suggested

The advisory recommends restricting interaction with the aws-mcp-server product to mitigate risk. Organizations should consider isolating or disabling the affected service until a vendor fix or alternative mitigation is provided. Monitor vendor communications for any updates.

Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of aws-mcp-server. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 9.8. The following CVEs are assigned: CVE-2026-5059.

Impact

Successful exploitation allows remote attackers to execute arbitrary code on the aws-mcp-server with no authentication required. This can lead to full compromise of the affected system, including complete loss of confidentiality, integrity, and availability. Given the critical CVSS score and unauthenticated remote exploitability, the impact is severe.

Summary

This vulnerability in aws-mcp-server involves a command injection flaw due to insufficient validation of user input before executing system calls. Remote attackers can exploit this to run arbitrary code without authentication. The Zero Day Initiative assigned a CVSS score of 9.8, indicating critical severity with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. The vendor has not issued a patch and has rejected the report. The advisory recommends restricting interaction with the product as the primary mitigation.

References

zerodayinitiative.com/advisories/ZDI-26-245/ (opens in a new tab)

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 26 May 2026, 20:14 UTC

Public exploits and detectionGitHub proofs of concept

References

Community reviews

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