FKIE_CVE-2026-33491

Vulnerability from fkie_nvd - Published: 2026-03-26 19:17 - Updated: 2026-05-01 14:38
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
Zen C is a systems programming language that compiles to human-readable GNU C/C11. Prior to version 0.4.4, a stack-based buffer overflow vulnerability in the Zen C compiler allows attackers to cause a compiler crash or potentially execute arbitrary code by providing a specially crafted Zen C source file (`.zc`) with excessively long struct, function, or trait identifiers. Users are advised to update to Zen C version v0.4.4 or later to receive a patch.
References
security-advisories@github.comhttps://github.com/zenc-lang/zenc/security/advisories/GHSA-rv74-w6q7-h8xrExploit, Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
zenc-lang zen_c *
To clipboard 

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  "configurations": [
    {
      "nodes": [
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          "cpeMatch": [
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              "criteria": "cpe:2.3:a:zenc-lang:zen_c:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "87358648-AF3A-4D67-86CE-03A43A883BC1",
              "versionEndExcluding": "0.4.4",
              "vulnerable": true
            }
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Zen C is a systems programming language that compiles to human-readable GNU C/C11. Prior to version 0.4.4, a stack-based buffer overflow vulnerability in the Zen C compiler allows attackers to cause a compiler crash or potentially execute arbitrary code by providing a specially crafted Zen C source file (`.zc`) with excessively long struct, function, or trait identifiers. Users are advised to update to Zen C version v0.4.4 or later to receive a patch."
    },
    {
      "lang": "es",
      "value": "Zen C es un lenguaje de programaci\u00f3n de sistemas que compila a GNU C/C11 legible por humanos. Antes de la versi\u00f3n 0.4.4, una vulnerabilidad de desbordamiento de b\u00fafer basado en pila en el compilador de Zen C permite a los atacantes causar un fallo del compilador o potencialmente ejecutar c\u00f3digo arbitrario al proporcionar un archivo fuente de Zen C especialmente dise\u00f1ado (\u0027.zc\u0027) con identificadores de estructura, funci\u00f3n o rasgo excesivamente largos. Se aconseja a los usuarios actualizar a la versi\u00f3n v0.4.4 de Zen C o posterior para recibir un parche."
    }
  ],
  "id": "CVE-2026-33491",
  "lastModified": "2026-05-01T14:38:20.020",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-26T19:17:04.333",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/zenc-lang/zenc/security/advisories/GHSA-rv74-w6q7-h8xr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.