CVE-2026-27824 · cross-distro fix matrix

CVE-2026-27824: calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, the calibre Content Server's brute-force protection mechanism uses a ban key derived from both `remote_addr` and the `X-Forwarded-For` header. Since the `X-Forwarded-For` head

Affects 2 Linux releases across 2 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2026-27824 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

calibre→ fixed in6.13.0+repack-2+deb12u6urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y calibre
```

Debian trixie

Source: Debian Security Tracker

calibre→ fixed in8.5.0+ds-1+deb13u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y calibre
```

Are YOU affected by CVE-2026-27824?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

CVE-2026-27824dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

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