CVE-2026-72761

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Source
https://cve.org/CVERecord?id=CVE-2026-72761
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72761.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-72761
Published
2026-08-10T14:33:13Z
Modified
2026-08-28T11:30:18Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N CVSS Calculator
Summary
Webhook SSRF guard bypassed by IPv6 transition addresses (NAT64/6to4/Teredo pass is_global check) in vulnerability-lookup
Details

The webhook URL validator in website/notifications/webhooks.py uses ip.is_global to reject non-public addresses after DNS resolution. IPv6 transition addresses (NAT64 64:ff9b::/96, 6to4 2002::/16, Teredo 2001:0000::/32) are classified as globally routable by IANA, so is_global returns True even when the embedded IPv4 targets a private, loopback, or cloud metadata destination. An attacker can register a webhook pointing at a hostname that resolves to a transition address to bypass the SSRF guard and exfiltrate vulnerability data to an internal endpoint.

The vulnerability was introduced on a non-release version. The fix was already done on HEAD. It only affects

organisation running the HEAD.

Database specific 
{
    "cna_assigner": "CIRCL",
    "cwe_ids": [
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72761.json"
}
References

Affected packages

Git / github.com/vulnerability-lookup/vulnerability-lookup

Affected ranges

Type
GIT
Repo
https://github.com/vulnerability-lookup/vulnerability-lookup
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
f3e0c6899c5b3823dcfd860fc6cb3edbedc9bf65
Database specific
Show details 
{
    "source": "REFERENCES"
}

Affected versions

v0.*
v0.5.0
v0.6.0
v0.7.0
v1.*
v1.0.0
v1.1.0
v1.2.0
v1.3.0
v1.4.0
v1.5.0
v1.6.0
v1.7.0
v2.*
v2.1.0
v2.10.0
v2.10.1
v2.12.0
v2.13.0
v2.15.0
v2.16.0
v2.16.1
v2.17.0
v2.18.0
v2.19.0
v2.2.0
v2.20.0
v2.21.0
v2.3.0
v2.4.0
v2.5.0
v2.6.0
v2.7.0
v2.7.1
v2.9.0
v3.*
v3.0.0
v3.0.1
v4.*
v4.0.0
v4.1.0
v4.2.0
v4.3.0
v4.4.0
v4.5.0
v4.6.0
v5.*
v5.0.0
v5.1.0
v5.2.0
v5.3.0
v5.4.0
v5.5.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72761.json"