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CVE-2026-54892

Estado: AplazadaAlta (8.7)—

Inefficient algorithmic complexity in Plug's nested-parameter decoder allows an unauthenticated remote attacker to cause denial of service. Plug.Conn.Query.decode/4 (and Plug.Conn.Query.decode_each/2) parse query strings and application/x-www-form-urlencoded request bodies. When a key contains many bracketed segments such as a[a][a][a]=1, the decoder walks the brackets and, for each of the N levels, performs a map operation keyed on an ever-growing binary prefix of the key, hashing the full byte range at each step. The total decode cost is therefore quadratic in the number of nesting levels.

With the default Plug.Parsers.URLENCODED body limit of 1,000,000 bytes, a single request can carry roughly 333,000 nesting levels and saturate a BEAM scheduler for minutes.

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A small number of concurrent requests can saturate all schedulers and render a Plug-based server unresponsive. No authentication or knowledge of application routes is required.

This vulnerability is associated with program files lib/plug/conn/query.ex and program routines Plug.Conn.Query.decode/4, Plug.Conn.Query.decode_each/2, Plug.Conn.Query.split_keys/6, Plug.Conn.Query.insert_keys/3, and Plug.Conn.Query.finalize_pointer/2.

This issue affects plug from 1.15.0 before 1.15.5, 1.16.4, 1.17.2, 1.18.3, and 1.19.3.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Elixir — PlugAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-54892",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-54892",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-23T13:03:58.893269Z"
        }
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 8.7,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/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:elixir-plug:plug:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/elixir-plug/plug",
          "vendor": "elixir-plug",
          "modules": [
            "'Elixir.Plug.Conn.Query'"
          ],
          "product": "plug",
          "versions": [
            {
              "status": "affected",
              "version": "1.15.0",
              "lessThan": "1.15.5",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.16.0",
              "lessThan": "1.16.4",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.17.0",
              "lessThan": "1.17.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.18.0",
              "lessThan": "1.18.3",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "1.19.0",
              "lessThan": "1.19.3",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:hex/plug",
          "packageName": "plug",
          "programFiles": [
            "lib/plug/conn/query.ex"
          ],
          "collectionURL": "https://repo.hex.pm",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.Plug.Conn.Query':decode/4"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':decode_each/2"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':split_keys/6"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':insert_keys/3"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':finalize_pointer/2"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*"
          ],
          "repo": "https://github.com/elixir-plug/plug",
          "vendor": "elixir-plug",
          "modules": [
            "'Elixir.Plug.Conn.Query'"
          ],
          "product": "plug",
          "versions": [
            {
              "status": "affected",
              "changes": [
                {
                  "at": "c317d08fdcf96e17931f7419275b2b8c4bf3e951",
                  "status": "unaffected"
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                {
                  "at": "9c5d37c440eaae92869eed7c014c47266744fadb",
                  "status": "unaffected"
                },
                {
                  "at": "d737eb236f17e31a36290e39f9ef3cd86a1343bd",
                  "status": "unaffected"
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                {
                  "at": "d4e5568392a4b29e545b91e12e87d6098f976145",
                  "status": "unaffected"
                },
                {
                  "at": "a61124aa625d819a218fb07f90afbac8aa85eb0e",
                  "status": "unaffected"
                }
              ],
              "version": "712b875d3442c765d8d37e546ffd5ad9f8afcc55",
              "lessThan": "*",
              "versionType": "git"
            }
          ],
          "packageURL": "pkg:github/elixir-plug/plug",
          "packageName": "elixir-plug/plug",
          "programFiles": [
            "lib/plug/conn/query.ex"
          ],
          "collectionURL": "https://github.com",
          "defaultStatus": "unaffected",
          "programRoutines": [
            {
              "name": "'Elixir.Plug.Conn.Query':decode/4"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':decode_each/2"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':split_keys/6"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':insert_keys/3"
            },
            {
              "name": "'Elixir.Plug.Conn.Query':finalize_pointer/2"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-06-23T13:16:43.167",
  "references": [
    {
      "url": "https://cna.erlef.org/cves/CVE-2026-54892.html",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-plug/plug/commit/9c5d37c440eaae92869eed7c014c47266744fadb",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-plug/plug/commit/a61124aa625d819a218fb07f90afbac8aa85eb0e",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-plug/plug/commit/c317d08fdcf96e17931f7419275b2b8c4bf3e951",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-plug/plug/commit/d4e5568392a4b29e545b91e12e87d6098f976145",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-plug/plug/commit/d737eb236f17e31a36290e39f9ef3cd86a1343bd",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-plug/plug/security/advisories/GHSA-j43x-5hjq-rgxf",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://osv.dev/vulnerability/EEF-CVE-2026-54892",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
    },
    {
      "url": "https://github.com/elixir-plug/plug/security/advisories/GHSA-j43x-5hjq-rgxf",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Inefficient algorithmic complexity in Plug's nested-parameter decoder allows an unauthenticated remote attacker to cause denial of service. Plug.Conn.Query.decode/4 (and Plug.Conn.Query.decode_each/2) parse query strings and application/x-www-form-urlencoded request bodies. When a key contains many bracketed segments such as a[a][a][a]=1, the decoder walks the brackets and, for each of the N levels, performs a map operation keyed on an ever-growing binary prefix of the key, hashing the full byte range at each step. The total decode cost is therefore quadratic in the number of nesting levels.\n\nWith the default Plug.Parsers.URLENCODED body limit of 1,000,000 bytes, a single request can carry roughly 333,000 nesting levels and saturate a BEAM scheduler for minutes. A small number of concurrent requests can saturate all schedulers and render a Plug-based server unresponsive. No authentication or knowledge of application routes is required.\n\nThis vulnerability is associated with program files lib/plug/conn/query.ex and program routines Plug.Conn.Query.decode/4, Plug.Conn.Query.decode_each/2, Plug.Conn.Query.split_keys/6, Plug.Conn.Query.insert_keys/3, and Plug.Conn.Query.finalize_pointer/2.\n\nThis issue affects plug from 1.15.0 before 1.15.5, 1.16.4, 1.17.2, 1.18.3, and 1.19.3."
    }
  ],
  "lastModified": "2026-06-23T15:44:39.343",
  "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"
}