CVE-2026-77242

See a problem?
Please try reporting it to the source first.
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
2026-10-01T03:47:33Z
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
0 Unknown introduced commit / All previous commits are affected
Fixed
b041733473f95119dd539542a43c280737a8e460
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "0.22.0"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ]
}

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"