‹ Back to list

CVE-2026-110240

Status: Awaiting AnalysisMedium (6.3)—
Severity6.3Medium · CVSS 4.0
Exploitation probability0.33 %higher than 25% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Lancet through 2.3.9 contains an SSRF protection bypass vulnerability in netutil.IsInternalIP that misclassifies IPv6 private, link-local, CGNAT and transition addresses as external. Attackers can supply hostnames resolving to these address forms, including NAT64, 6to4 or Teredo embedding internal IPv4, to reach internal services or cloud metadata endpoints.

CVSS

Base score
6.3
Version
4.0
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.33 %
Percentile among all scored CVEs
25
Score date
10/22/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vector AV:N/PR:N/UI:N indica explotación remota sin credenciales; el bypass SSRF en IsInternalIP permite alcanzar servicios internos y endpoints de metadatos cloud.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Filter Network TrafficLimit Access to Resource Over NetworkVulnerability ScanningSSL/TLS InspectionPrivileged Account ManagementNetwork Segmentation

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Lancet — LancetAI

CWEs

References

Show 8 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-110240",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-110240",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-13T19:24:08.615533Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "disclosure@vulncheck.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.8,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 2.2
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "disclosure@vulncheck.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.3,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "NONE",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "LOW",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "disclosure@vulncheck.com",
      "affectedData": [
        {
          "repo": "https://github.com/duke-git/lancet",
          "vendor": "duke-git",
          "product": "lancet",
          "versions": [
            {
              "status": "affected",
              "version": "2.1.2",
              "versionType": "semver",
              "lessThanOrEqual": "2.3.9"
            }
          ],
          "packageURL": "pkg:golang/github.com/duke-git/lancet/v2",
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://github.com/duke-git/lancet",
          "vendor": "duke-git",
          "product": "lancet",
          "versions": [
            {
              "status": "affected",
              "version": "1.3.1",
              "versionType": "semver",
              "lessThanOrEqual": "1.4.6"
            }
          ],
          "packageURL": "pkg:golang/github.com/duke-git/lancet",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-10-13T19:18:49.350",
  "references": [
    {
      "url": "https://github.com/duke-git/lancet",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/duke-git/lancet/blob/v1.4.6/netutil/net.go#L158-L170",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/duke-git/lancet/blob/v2.3.9/netutil/net.go#L192-L205",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/duke-git/lancet/commit/835111c832939a85416d686a1e99d5fe7060c9b4",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/duke-git/lancet/issues/356",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/duke-git/lancet/pull/357",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://www.vulncheck.com/advisories/lancet-through-2.3.9-ssrf-protection-bypass-via-netutil-isinternalip",
      "source": "disclosure@vulncheck.com"
    },
    {
      "url": "https://github.com/duke-git/lancet/issues/356",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "disclosure@vulncheck.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Lancet through 2.3.9 contains an SSRF protection bypass vulnerability in netutil.IsInternalIP that misclassifies IPv6 private, link-local, CGNAT and transition addresses as external. Attackers can supply hostnames resolving to these address forms, including NAT64, 6to4 or Teredo embedding internal IPv4, to reach internal services or cloud metadata endpoints."
    }
  ],
  "lastModified": "2026-10-13T20:17:28.220",
  "sourceIdentifier": "disclosure@vulncheck.com"
}