Is CVE-2026-25636 in the CISA KEV catalog?

No. CVE-2026-25636 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-25636?

CVE-2026-25636 has a CVSS v3 base score of 8.2 (HIGH).

What is the EPSS score for CVE-2026-25636?

CVE-2026-25636 has an EPSS score of 0.21% (11th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25636?

Upgrade calibre on debian 11 to 5.12.0+dfsg-1+deb11u4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2026-25636

HIGH

8.2

CVSS v3

NVD

Description

calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

CWE-22Path Traversal CWE-73External Control of File Name or Path CWE-94Code Injection

How to fix

Remediation Available

calibreDebian

Fixed in:5.12.0+dfsg-1+deb11u4CVE-2026-25636

Fixed in:6.13.0+repack-2+deb12u6CVE-2026-25636

Fixed in:8.5.0+ds-1+deb13u2CVE-2026-25636

Fixed in:9.2.0+ds+~0.10.5-1CVE-2026-25636

calibreWindows application

Affected:9.2.0Fixed in:9.2.0Kovid Goyal

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

Exploit Intelligence

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Patch1

github.com

Exploit2

Related Vulnerabilities

Other CWE-22 (Path Traversal) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-23897	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-32315	High	8.6	100%	KEV	Fix
CVE-2022-29464	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-26086	Medium	5.3	100%	KEV	Fix
CVE-2021-22005	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-5902	Critical	9.8	100%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-17.