CVE catalog
CVE-2025-4086
A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog. *This bug only affects Thunderbird for An
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.29% · Oct 25, 2026
A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog. *This bug only affects Thunderbird for Android. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138 and Thunderbird 138.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | firefox | Not reported | 138.0 | fixed |
| Cpe | thunderbird | Not reported | 138.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | firefox | cpe | Not reported | 138.0 | Not reported | NVD-CVE-2025-4086 | Not reported |
| Cpe | thunderbird | cpe | Not reported | 138.0 | Not reported | NVD-CVE-2025-4086 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11373-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2025-4086]
- [https://wid.cert-bund.de/.well-known/csaf/white/2025/wid-sec-w-2025-0901.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [SUSE security advisories and VEX]