CVE-2025-6196 | Libgepub: integer overflow in libgepub's epub archive handling

Exp

A flaw was found in libgepub, a library used to read EPUB files. The software mishandles file size calculations when opening specially crafted EPUB files, leading to incorrect memory allocations. This issue causes the application to crash. Known affected usage includes desktop services like Tumbler, which may process malicious files automatically when browsing directories. While no direct remote attack vectors are confirmed, any application using libgepub to parse user-supplied EPUB content could be vulnerable to a denial of service.

Published: 2025-06-17 Last update: 2025-08-12 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-6196 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2025-6196

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2025-6196

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-13 0.03% 0.07% +0.04%
2 2025-11-13 0.05% 0.03% -0.02%
3 2025-10-17 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-6196

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2025-6196

OS Trackers for CVE-2025-6196

vendor priority summary link
debian not yet assigned CVE-2025-6196 not yet assigned priority: Debian including 1 source packages (libgepub), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2025-6196
redhat medium — https://access.redhat.com/security/cve/CVE-2025-6196
suse medium — https://www.suse.com/security/cve/CVE-2025-6196/
ubuntu medium CVE-2025-6196 medium priority: Ubuntu including 1 source packages (libgepub), 8 status rows across 8 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream): needs-triage 4, not-affected 2, ignored 1, released 1. https://ubuntu.com/security/CVE-2025-6196

Affected software / configurations for CVE-2025-6196

Vendor Product Version Raw CPE
gnome libgepub — cpe:2.3:a:gnome:libgepub:-:*:*:*:*:*:*:*

References for CVE-2025-6196

URL Tags
https://access.redhat.com/security/cve/CVE-2025-6196 Mitigation Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2373117 Issue Tracking Third Party Advisory
https://gitlab.gnome.org/GNOME/libgepub/-/issues/18 Exploit Issue Tracking Third Party Advisory
cvelogic Threat Intelligence