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CVE-2026-14899 Off-by-one out of bounds read in MIME header parser for forwarding

🗓️ 22 Jul 2026 19:19:42Reported by mozillaType 
cvelist
 cvelist
🔗 www.cve.org👁 5 Views

Off by one out of bounds read in MIME header parsing for forwarding could crash Thunderbird; fixed in 153 and 140.13.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-14899
22 Jul 202619:19
attackerkb
CVE
CVE-2026-14899
22 Jul 202619:19
cve
EUVD
EUVD-2026-47773
22 Jul 202619:19
euvd
Mozilla
Security Vulnerabilities fixed in Thunderbird 153 — Mozilla
21 Jul 202600:00
mozilla
Mozilla
Security Vulnerabilities fixed in Thunderbird 140.13 — Mozilla
21 Jul 202600:00
mozilla
NVD
CVE-2026-14899
22 Jul 202620:16
nvd
Positive Technologies
PT-2026-63484
22 Jul 202600:00
ptsecurity
[
  {
    "product": "Thunderbird",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "140.13",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "153",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  }
]

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