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CVE-2026-42530

Full vulnerability record from the local CVENow database.

Description

NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Severity
CRITICAL
CVSS score
9.2 (v4.0)
Vulnerability status
Modified
Source identifier
[email protected]
Published
2026-06-17 15:16:50.630000
Last modified
2026-10-26 12:10:00.130000
View original CVE JSON 
{
  "id": "CVE-2026-42530",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-17T15:16:50.630",
  "lastModified": "2026-10-26T12:10:00.130",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
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      "value": "NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.  \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
    },
    {
      "lang": "es",
      "value": "NGINX Open Source tiene una vulnerabilidad en el módulo ngx_http_v3_module. Cuando NGINX Open Source está configurado para usar el módulo HTTP/3 QUIC, un atacante remoto no autenticado, junto con condiciones fuera de su control, puede usar una sesión HTTP/3 especialmente diseñada para reabrir un flujo de codificador QPACK. Esto puede causar un uso después de liberación en el proceso de trabajador de NGINX, lo que lleva a un reinicio. Además, los atacantes pueden ejecutar código en sistemas con la aleatorización del espacio de direcciones (ASLR) deshabilitada o cuando el atacante puede eludir ASLR.\n\nNota: Las versiones de software que han alcanzado el fin del soporte técnico (EoTS) no se evalúan."
    }
  ],
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      "affectedData": [
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          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED"
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          "role": "CISA Coordinator",
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}