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9.8
Debian Linux: Unrestricted File Access
DEBIAN-CVE-2026-8956
Summary
A security flaw in Debian Linux can allow unauthorized users to access and modify sensitive files. This affects Debian Linux systems and can compromise system integrity. To protect your system, ensure you have the latest updates installed and consider implementing additional security measures.
What to do
- Update debian firefox-esr to version 140.11.0esr-1~deb11u1.
- Update debian firefox-esr to version 140.11.0esr-1~deb12u1.
- Update debian firefox-esr to version 140.11.0esr-1~deb13u1.
- Update debian thunderbird to version 1:140.11.0esr-1~deb12u1.
- Update debian thunderbird to version 1:140.11.0esr-1~deb13u1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Debian:11 | debian | firefox-esr |
< 140.11.0esr-1~deb11u1 Fix: upgrade to 140.11.0esr-1~deb11u1
|
| Debian:12 | debian | firefox-esr |
< 140.11.0esr-1~deb12u1 Fix: upgrade to 140.11.0esr-1~deb12u1
|
| Debian:13 | debian | firefox-esr |
< 140.11.0esr-1~deb13u1 Fix: upgrade to 140.11.0esr-1~deb13u1
|
| Debian:14 | debian | firefox-esr | All versions |
| Debian:11 | debian | thunderbird | All versions |
| Debian:12 | debian | thunderbird |
< 1:140.11.0esr-1~deb12u1 Fix: upgrade to 1:140.11.0esr-1~deb12u1
|
| Debian:13 | debian | thunderbird |
< 1:140.11.0esr-1~deb13u1 Fix: upgrade to 1:140.11.0esr-1~deb13u1
|
| Debian:14 | debian | thunderbird | All versions |
Original title
Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Original description
Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
- https://security-tracker.debian.org/tracker/CVE-2026-8956 Vendor Advisory
Published: 19 May 2026 · Updated: 21 May 2026 · First seen: 19 May 2026