Vulnerability · NVD

CVE-2026-110247

CVE-2026-110247, rated high by the vendor: 1 tracked app concerned, 1 still exposed on its current version.

Severity (CVSS): -
Exploitation: -
Tracked apps: 1
Still exposed: 1

Vendor bulletin scale : NVD CVSS pending Published on 2026-10-13

Several buffer-growth sites in libmime performed size arithmetic in 32-bit types without overflow checks. On a sufficiently large message the growth guard could fail open, or the buffer could be reallocated smaller than required, and a subsequent memcpy would then write attacker-controlled data across adjacent heap allocations. This vulnerability was fixed in Thunderbird 158.

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Mozilla Thunderbird Windows winget:Mozilla.Thunderbird

Affected <158 Fixed in 158 Latest tracked 157.0.1 still vulnerable

Observed affected builds (135)

157.0.1 157.0 156.0.1 156.0 155.0.1 155.0 154.0 153.0.3 153.0.2 153.0.1 153.0 152.0.1 152.0 151.0.1 151.0 150.0.2 150.0.1 150.0 149.0.2 149.0.1 149.0 148.0.1 148.0 147.0.2 147.0.1 147.0 146.0.1 146.0 145.0 144.0.1 +105 · see history

Vulnerable CPE configurations (1)

Vendor	Product	Platform	Versions	CPE 2.3 URI
mozilla	thunderbird All platforms (wildcard)	All platforms (wildcard)	<158	cpe:2.3:a:mozilla:thunderbird::::::::

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