CVE-2023-29542
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk61th percentile - higher than 61% of all known CVEs
Summary
A newline in a filename could be used to bypass file extension security mechanisms that replace malicious extensions such as .lnk with .download, potentially leading to accidental execution of malicious code. This affects Firefox and Thunderbird on Windows: Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 102.10.
Risk Assessment
A user could inadvertently execute a malicious file, potentially leading to workstation compromise and data theft.
Recommendation
Update Firefox to 112 or later, Firefox ESR to 102.10 or later, and Thunderbird to 102.10 or later. Educate users about the risks of opening unknown files.
Other vulnerabilities in Firefox and Thunderbird
See all- CVE-2026-113400Medium
An uninitialized memory vulnerability in the Audio/Video: cubeb component of Firefox and Thunderbird. The issue was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
- CVE-2026-113399Critical
Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
- CVE-2026-118013Low risk· EPSS 4%
Use-after-free vulnerability in the Layout: Images, Video, and HTML Frames component of Firefox and Thunderbird. It may lead to undefined behavior or potential code execution. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118012Low risk· EPSS 4%
Use-after-free vulnerability in the DOM: Animation component of Firefox and Thunderbird. It may lead to undefined behavior or potential code execution. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118011Low risk· EPSS 4%
Frame poisoning vulnerability in the CSS Parsing and Computation component of Firefox and Thunderbird. It may lead to undefined behavior or potential code execution. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118010Low risk· EPSS 4%
Use-after-free vulnerability in the Disability Access APIs component of Firefox and Thunderbird. It may lead to undefined behavior or potential code execution. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118009Low risk· EPSS 4%
Integer overflow and use-after-free vulnerability in the Graphics: Text component of Firefox and Thunderbird. It may lead to undefined behavior or potential code execution. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118007Low risk· EPSS 4%
Use-after-free vulnerability in the JavaScript: GC component of Firefox and Thunderbird. It may lead to undefined behavior or potential code execution. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118006Low risk· EPSS 4%
Privilege escalation vulnerability due to use-after-free in the WebRTC: Signaling component of Firefox and Thunderbird. It may lead to privilege escalation within the application context. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
- CVE-2026-118005Low risk· EPSS 4%
Use-after-free vulnerability in the WebRTC: Signaling component of Firefox and Thunderbird. It may lead to undefined behavior or potential code execution. The vulnerability was fixed in Firefox 159 and Thunderbird 159.
Original NVD description (English source)
A newline in a filename could have been used to bypass the file extension security mechanisms that replace malicious file extensions such as .lnk with .download. This could have led to accidental execution of malicious code. *This bug only affects Firefox and Thunderbird on Windows. Other versions of Firefox and Thunderbird are unaffected.* This vulnerability affects Firefox < 112, Firefox ESR < 102.10, and Thunderbird < 102.10.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS