CVE-2026-92238
published 2026-09-15CVE-2026-92238: A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in…
PriorityP347critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.54%
43.7th percentile
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | thunderbird | < Thunderbird 140.16 | Thunderbird 140.16 |
| mozilla | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < 140.16.0 | 140.16.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | thunderbird | >= 154.0 < 156.0 | 156.0 |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_redhat6.1MEDIUM
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Red Hat
thunderbird: Thunderbird: Memory safety violations via maliciously crafted mail headers
vendor_redhat·2026-09-15·CVSS 6.1
CVE-2026-92238 [MEDIUM] CWE-843 thunderbird: Thunderbird: Memory safety violations via maliciously crafted mail headers
thunderbird: Thunderbird: Memory safety violations via maliciously crafted mail headers
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
A flaw was found in Thunderbird where a maliciously constructed mail header could lead to ambiguous parsing. This vulnerability could result in multiple mail header fields being incorrectly interpreted as one, or cause memory safety violations. A remote attacker could potentially exploit this to trigger unexpected application behavior or a denial of service.
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: thunderbird (Red Hat Enterprise Linux 10)
Mozilla
Mozilla Foundation Security Advisory 2026-95: CVE-2026-92238
vendor_mozilla
CVE-2026-92238 Mozilla Foundation Security Advisory 2026-95: CVE-2026-92238
Mozilla Foundation Security Advisory 2026-95
CVE: CVE-2026-92238
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92238
vendor_mozilla
CVE-2026-92238 Mozilla Foundation Security Advisory 2026-96: CVE-2026-92238
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92238
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92238
vendor_mozilla
CVE-2026-92238 Mozilla Foundation Security Advisory 2026-94: CVE-2026-92238
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92238
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
GHSA
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations.
ghsa_unreviewed·2026-09-15
CVE-2026-92238 A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations.
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156 and Thunderbird 140.16.
No detection rules found.
No public exploits indexed.
2026-09-15
Published