CVE-2026-77242

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Source

https://cve.org/CVERecord?id=CVE-2026-77242

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77242.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-77242

Aliases

GHSA-72fm-whvq-jghf

Published

2026-09-22T17:58:41Z

Modified

2026-10-21T02:59:47Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N CVSS Calculator

Summary

MCP Atlassian: Incomplete fix for CVE-2026-27826: DNS rebinding bypasses SSRF validation (validated IP not pinned)

Details

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf checks a hostname's resolved addresses, but Requests and urllib3 resolve the hostname again when connecting. A caller can use a short-lived DNS answer that is public during validation and private during connection, preserving unauthenticated access to internal or metadata endpoints despite the earlier CVE-2026-27826 remediation. The advisory traces the vulnerable input and processing flow through validate_url_for_ssrf, _check_dns_resolution, socket.getaddrinfo, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-367",
        "CWE-918"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77242.json"
}

References

Affected packages

Git / github.com/sooperset/mcp-atlassian

Affected ranges

Type

GIT

Repo

https://github.com/sooperset/mcp-atlassian

Events

Introduced

Fixed

b041733473f95119dd539542a43c280737a8e460

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.22.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "b041733473f95119dd539542a43c280737a8e460"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v0.22.0",
            "range":  [
                {
                    "fixed":  "b041733473f95119dd539542a43c280737a8e460"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "cpe":  "cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.22.0"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}

Affected versions

v0.*

v0.1.10

v0.1.11

v0.1.12

v0.1.13

v0.1.14

v0.1.15

v0.1.16

v0.1.4

v0.1.5

v0.1.6

v0.1.7

v0.1.8

v0.10.0

v0.10.1

v0.10.2

v0.10.3

v0.10.4

v0.10.5

v0.10.6

v0.11.0

v0.11.1

v0.11.10

v0.11.11

v0.11.12

v0.11.2

v0.11.3

v0.11.4

v0.11.5

v0.11.6

v0.11.7

v0.11.8

v0.11.9

v0.12.0

v0.13.0

v0.13.1

v0.14.0

v0.14.1

v0.14.2

v0.14.3

v0.15.0

v0.16.0

v0.16.1

v0.17.0

v0.18.0

v0.18.1

v0.19.0

v0.2.0

v0.2.1

v0.2.2

v0.2.3

v0.2.4

v0.2.5

v0.2.6

v0.20.0

v0.20.1

v0.21.0

v0.21.1

v0.3.0

v0.3.1

v0.4.0

v0.5.0

v0.6.0

v0.6.1

v0.6.2

v0.6.3

v0.6.4

v0.6.5

v0.7.0

v0.7.1

v0.8.0

v0.8.1

v0.8.2

v0.8.3

v0.8.4

v0.9.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77242.json"