Vulnerability-Lookup

CVE-2026-91988 (GCVE-0-2026-91988)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 15:50

Title

atomic-agents-stack before 1.1.0 Remote Code Execution via HTTP MCP

Summary

atomic-agents-stack before 1.1.0 accepts cleartext HTTP schemes in the HTTP MCP server-registry backend factory, allowing network man-in-the-middle attackers to rewrite catalog responses. Attackers can inject arbitrary command and argument values that are spawned as local subprocesses by MCPClientPool to achieve code execution on the agent host.

Severity

9.2 (Critical)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 15:48 UTC

CWE

CWE-319 - Cleartext Transmission of Sensitive Information

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/dep0we/atomic-agents-stack/sec…	vendor-advisory
https://www.vulncheck.com/advisories/atomic-agent…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
dep0we	atomic-agents-stack	Affected: 0 , < 1.1.0 (semver) Unaffected: 1.1.0 (semver)	guessed

Date Public

2026-06-10 00:00

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-91988

Vulnerability from fkie_nvd - Published: 2026-09-15 16:17 - Updated: 2026-09-15 16:17

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-xhcr-cqfr-m3hv
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/atomic-agents-stack-before-1.1.0-remote-code-execution-via-http-mcp

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/atomic-agents-stack",
          "product": "atomic-agents-stack",
          "vendor": "dep0we",
          "versions": [
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              "lessThan": "1.1.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
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              "versionType": "semver"
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    }
  ],
  "id": "CVE-2026-91988",
  "lastModified": "2026-09-15T16:17:57.450",
  "metrics": {
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        "cvssData": {
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          "baseScore": 8.1,
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          "confidentialityImpact": "HIGH",
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        "impactScore": 5.9,
        "source": "disclosure@vulncheck.com",
        "type": "Primary"
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          "modifiedAttackComplexity": "NOT_DEFINED",
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}

GHSA-WR36-693X-8MGC

Vulnerability from github – Published: 2026-09-15 18:32 – Updated: 2026-09-15 18:32

Details

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

9.2 (Critical)


                  
                    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-91988"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-319"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-15T16:17:57Z",
    "severity": "CRITICAL"
  },
  "details": "atomic-agents-stack before 1.1.0 accepts cleartext HTTP schemes in the HTTP MCP server-registry backend factory, allowing network man-in-the-middle attackers to rewrite catalog responses. Attackers can inject arbitrary command and argument values that are spawned as local subprocesses by MCPClientPool to achieve code execution on the agent host.",
  "id": "GHSA-wr36-693x-8mgc",
  "modified": "2026-09-15T18:32:31Z",
  "published": "2026-09-15T18:32:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dep0we/atomic-agents-stack/security/advisories/GHSA-xhcr-cqfr-m3hv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91988"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/atomic-agents-stack-before-1.1.0-remote-code-execution-via-http-mcp"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-91988 (GCVE-0-2026-91988)

FKIE_CVE-2026-91988

GHSA-WR36-693X-8MGC

Tags

Sightings

Nomenclature

Related by attack behaviour