What is CVE-2018-7889?

CVE-2018-7889 is a high-severity vulnerability in Calibre-Ebook Calibre, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2018-03-08.

How severe is CVE-2018-7889?

High severity. CVSS v3 base score is 7.8 out of 10.

Deserialization in Calibre-Ebook Calibre

CVE-2018-7889

gui2/viewer/bookmarkmanager.py in Calibre 3.18 calls cPickle.load on imported bookmark data, which allows remote attackers to execute arbitrary code via a crafted .pickle file, as demonstrated by Python code that contains an os.system call.

Vulnerability class: Insecure Deserialization

Published 2018-03-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.045 (91.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.045 · newest: 0.045 · change: 0.000

Affected products

Calibre-Ebook Calibre — versions 3.18.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

bugs.launchpad.net/calibre/+bug/1753870 (Exploit, Third Party Advisory)
github.com/kovidgoyal/calibre/commit/aeb5b036a0bf657951756688b3c72bd68b6e4a7d (Patch)

Frequently asked questions

What is CVE-2018-7889?: CVE-2018-7889 is a high-severity vulnerability in Calibre-Ebook Calibre, classified under Deserialization of Untrusted Data. CVSS score: 7.8/10. Published 2018-03-08.
How severe is CVE-2018-7889?: High severity. CVSS v3 base score is 7.8 out of 10.