7.8

CVE-2026-25731: calibre-ebook calibre

CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-25731DEBIAN-CVE-2026-25731
Published 06-02-2026Last modified 06-02-2026
Open JSON

Vulnerability summary

CVE-2026-25731 is a high (CVSS 7.8) vulnerability in calibre-ebook calibre. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
41/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.29%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:10587-1

Timeline

  1. 06-02-2026
    PublishedVulnerability first disclosed.
  2. 06-02-2026
    Last modifiedVulnerability information updated.

Description

calibre is an e-book manager. Prior to 9.2.0, a Server-Side Template Injection (SSTI) vulnerability in Calibre's Templite templating engine allows arbitrary code execution when a user converts an ebook using a malicious custom template file via the --template-html or --template-html-index command-line options. This vulnerability is fixed in 9.2.0.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

20%

Versus all other CVEs

30-day change

+0.04 pp

From 0.25% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Calibre

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Calibre-ebook1 product
Debian1 product
  • calibre< 6.13.0+repack-2+deb12u6 | < 8.5.0+ds-1+deb13u2 | < 9.2.0+ds+~0.10.5-1
Kovidgoyal1 product
Ubuntu1 product
  • calibreAll versions (No fix recorded)

4 vendors · 4 products

References

5 links