Dashboard / CVE-2026-14899

CVE-2026-14899

HIGH
MEDIUM Priority: 0.04 BB Relevance: 75/100
Published: 2026-07-22 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: High
I: None
A: None

Description

The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
mozilla thunderbird < 140.13.0

References & Advisories (3)

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploitation Probability

0.47%
Raw Score 0.004690
Percentile 40.5%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00469
2026-10-28
0.00469

Intelligence Sources

nvd ref →

External Links