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CVE-2026-110449

Status: DeferredHigh (7.5)—
Severity7.5High · CVSS 3.1
Exploitation probability0.25 %higher than 15% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

Nix before 2.35.3 and Lix before 2.95.4 have an integer overflow and resultant out-of-bounds write when evaluating untrusted expressions because list allocation is mishandled.

CVSS

Base score
7.5
Version
3.1
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.25 %
Percentile among all scored CVEs
15
Score date
10/20/2026

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 permite explotación remota sin credenciales; el texto describe escritura fuera de límites al evaluar expresiones no confiables, sin decir qué consigue el atacante.

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

Vulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Affected technologies (2)

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

LIX Project — LIXAINixos — NIXAI

CWEs

References

Show 1 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-110449",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-110449",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-14T14:22:11.834069Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "cve@mitre.org",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4.7,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "NixOS",
          "product": "Nix",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "2.28.8",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "2.29.0",
              "lessThan": "2.30.6",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "2.31.0",
              "lessThan": "2.31.6",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "2.32.0",
              "lessThan": "2.34.9",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "2.35.0",
              "lessThan": "2.35.3",
              "versionType": "semver"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
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  ],
  "published": "2026-10-14T04:18:17.317",
  "references": [
    {
      "url": "https://discourse.nixos.org/t/security-advisory-for-nix-and-lix-october-2026/80547",
      "source": "cve@mitre.org"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
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      "type": "Secondary",
      "source": "cve@mitre.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nix before 2.35.3 and Lix before 2.95.4 have an integer overflow and resultant out-of-bounds write when evaluating untrusted expressions because list allocation is mishandled."
    }
  ],
  "lastModified": "2026-10-16T19:56:15.773",
  "sourceIdentifier": "cve@mitre.org"
}