CVE-2026-70667

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Source
https://cve.org/CVERecord?id=CVE-2026-70667
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70667.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-70667
Aliases
Related
Published
2026-08-18T18:55:44Z
Modified
2026-09-10T03:30:44Z
Severity
  • 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
Summary
Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects and DNS rebinding (incomplete fix for CVE-2026-55162)
Details

Lemur manages TLS certificate creation. Prior to 1.9.3, _validate_revocation_url in lemur/certificates/verify.py checked the original CRL or OCSP URL but the later request could reach a different destination. The CRL requests.get call followed HTTP redirects without validating each Location target, so a public attacker-controlled URL could redirect to loopback, RFC1918, link-local, or instance-metadata addresses. Validation and connection also performed separate DNS resolutions, creating a time-of-check time-of-use window for DNS rebinding on both CRL and OCSP paths. An operator uploading a certificate through POST /api/1/certificates/upload could therefore induce blind internal requests despite the earlier mitigation. The fix disables redirects and pins validated addresses while preserving the correct Host value. This issue is fixed in version 1.9.3.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-367",
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70667.json"
}
References

Affected packages

Git / github.com/netflix/lemur

Affected ranges

Type
GIT
Repo
https://github.com/netflix/lemur
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ed504a830f38a83825b1570302e9f38d6553938a
Fixed
726506d15a6da8d9bcf5c39b4dc0c95535cf03c0
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.9.3"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.1
0.1.2
0.1.3
0.1.4
0.1.5
0.2
0.2.1
0.2.2
0.3.0
0.4.0
0.5.0
0.6.0
0.7.0
0.8.0
v0.*
v0.10.0
v0.11.0
v0.8.1
v0.9.0
v1.*
v1.0.0
v1.1.0
v1.2.0
v1.3.0
v1.3.1
v1.3.2
v1.4.0
v1.5.0
v1.6.0
v1.7.0
v1.8.0
v1.8.1
v1.8.2
v1.9.0
v1.9.1
v1.9.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70667.json"