CVE-2026-40684 in Exim

Sumário

de MITRE • 01/05/2026

In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.

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• Divulgação: 01/05/2026
• Moderação: aceite
• Entrada: VDB-360393
• CPE: pronto
• CWE: CWE-404 (confirmado)
• CVSS: 5.3 (VulDB)
• EPSS: 0.00190
• KEV: não
• Atividades: muito baixo
• Sector: Chemical, Energy, ...

Fontes

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-40684
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40684
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-40684/