Description
KeePassXC is a cross-platform community-driven port of the Windows application KeePass Password Safe. From 2.3.0 until 2.8.0, KeePassXC browser integration encrypts authorized responses in src/browser/BrowserMessageBuilder.cpp using a fixed 1 MiB output vector even though Botan::Sodium::crypto_box_easy() writes the plaintext length plus crypto_box_MACBYTES. A browser-protocol client that can access the per-user IPC endpoint, has a valid database association, and causes an unlocked database to generate and encrypt a sufficiently large authorized response can trigger a sequential out-of-bounds write before any response is delivered. This issue is fixed in version 2.8.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| keepassxreboot | keepassxc | >= 2.3.0, < 2.8.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | keepassxc | 2.8.0+dfsg1-1 | — |
| Debian 13 | keepassxc | No fix yet | — |
| Debian 12 | keepassxc | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | keepassxc | No fix yet | — |
| Ubuntu 26.04 LTS | keepassxc | No fix yet | — |
| Ubuntu 24.04 LTS | keepassxc | No fix yet | — |
| Ubuntu 22.04 LTS | keepassxc | No fix yet | — |
| Ubuntu 20.04 LTS | keepassxc | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | keepassxc | No fix yet | — |
Advisories 1
- WID-SEC-2026-3560 KeePassXC: Mehrere Schwachstellen ermöglichen Denial of Service und Offenlegung BSI CERT-Bund (WID) · Oct 29, 2026