CVE-2026-97853

Status: DeferredMedium (6.9)—

Memory Allocation with Excessive Size Value vulnerability in ericmj decimal allows Denial of Service.

Decimal.round/3 builds the full result for the requested number of decimal places before the context precision (34 digits by default) is applied, so its cost grows with the places argument instead of with the size of the result. For positive places it appends places zero digits to the coefficient as a charlist before converting it to an integer, and for negative places it builds a charlist of -places zero digits. A single call such as Decimal.round(Decimal.new("1.5"), -50_000_000) allocates about 5.5 GB of memory, which can exhaust available memory and get the BEAM VM killed. The oldest releases instead loop once per decimal place, consuming CPU in proportion to places.

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Any application that passes a user-supplied number of decimal places or scale to Decimal.round/2 or Decimal.round/3 without bounding it is exposed. The input limits added for CVE-2026-32686 do not cover the places argument.

This issue affects decimal: from 0.1.0 before 3.1.2.

CVSS

Version: 4.0
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/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
Base score: 6.9

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.14%
Percentile among all scored CVEs: 3
Score date: 10/13/2026

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.

ExploitationT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Primary impactT1499.004 Application or System Exploitationimpact85 %

Vulnerabilidad local (AV:L, PR:N) de asignación excesiva de memoria en Decimal.round/3 que agota RAM y mata la VM. Requiere acceso local sin privilegios.

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

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Affected technologies (1)

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

Ericmj — Decimal^AI

CWEs

CWE-789

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-97853",
  "cveTags": [],
  "metrics": {
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 6.9,
          "Automatable": "NOT_DEFINED",
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/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": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "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": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:ericmj:decimal:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/ericmj/decimal",
          "vendor": "ericmj",
          "modules": [
            "'Elixir.Decimal'"
          ],
          "product": "decimal",
          "versions": [
            {
              "status": "affected",
              "version": "0.1.0",
              "lessThan": "3.1.2",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:hex/decimal",
          "packageName": "decimal",
          "programFiles": [
            "lib/decimal.ex"
          ],
          "collectionURL": "https://repo.hex.pm",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.Decimal':round/2"
            },
            {
              "name": "'Elixir.Decimal':round/3"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:ericmj:decimal:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/ericmj/decimal",
          "vendor": "ericmj",
          "modules": [
            "'Elixir.Decimal'"
          ],
          "product": "decimal",
          "versions": [
            {
              "status": "affected",
              "changes": [
                {
                  "at": "338f42c8cf6a9749ab70c5af04734c6050ca3dc6",
                  "status": "unaffected"
                },
                {
                  "at": "3c90af4c3c2dfa4bb4c138760a326dd0eb91822b",
                  "status": "unaffected"
                }
              ],
              "version": "05bb73eb40ddef24eda782d905766f56a3660522",
              "lessThan": "*",
              "versionType": "git"
            }
          ],
          "packageURL": "pkg:github/ericmj/decimal",
          "packageName": "ericmj/decimal",
          "programFiles": [
            "lib/decimal.ex"
          ],
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.Decimal':round/2"
            },
            {
              "name": "'Elixir.Decimal':round/3"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-10-10T20:16:47.640",
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-97853.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ericmj/decimal/commit/05bb73eb40ddef24eda782d905766f56a3660522",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ericmj/decimal/commit/338f42c8cf6a9749ab70c5af04734c6050ca3dc6",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ericmj/decimal/commit/3c90af4c3c2dfa4bb4c138760a326dd0eb91822b",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/ericmj/decimal/security/advisories/GHSA-6c27-994x-c52f",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-97853",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
        {
          "lang": "en",
          "value": "CWE-789"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Memory Allocation with Excessive Size Value vulnerability in ericmj decimal allows Denial of Service.\n\nDecimal.round/3 builds the full result for the requested number of decimal places before the context precision (34 digits by default) is applied, so its cost grows with the places argument instead of with the size of the result. For positive places it appends places zero digits to the coefficient as a charlist before converting it to an integer, and for negative places it builds a charlist of -places zero digits. A single call such as Decimal.round(Decimal.new(\"1.5\"), -50_000_000) allocates about 5.5 GB of memory, which can exhaust available memory and get the BEAM VM killed. The oldest releases instead loop once per decimal place, consuming CPU in proportion to places.\n\nAny application that passes a user-supplied number of decimal places or scale to Decimal.round/2 or Decimal.round/3 without bounding it is exposed. The input limits added for CVE-2026-32686 do not cover the places argument.\n\nThis issue affects decimal: from 0.1.0 before 3.1.2."
    }
  ],
  "lastModified": "2026-10-13T14:31:20.750",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}