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CVE-2026-5731

🗓️ 07 Apr 2026 12:43:11Reported by mozillaType 
cve
 cve
🔗 web.nvd.nist.gov👁 26 Views

Memory safety bugs fixed in Firefox and Thunderbird across ESR and standard releases; some could execute code.

Related
Detection
Affected
Refs
NVD
Node
mozillafirefoxMatch115.34.0esr
OR
mozillafirefoxMatch140.9.0esr
OR
mozillafirefoxMatch149.0.1-
OR
mozillathunderbirdMatch140.9.0esr
OR
mozillathunderbirdMatch149.0.1-
[
  {
    "product": "Firefox",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "115.34.1",
        "lessThanOrEqual": "115.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "140.9.1",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "149.0.2",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  },
  {
    "product": "Thunderbird",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "140.9.1",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "149.0.2",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  }
]

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16 Apr 2026 18:59Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.19.8
EPSS0.00071
SSVC
26