How severe is CVE-2024-56139?

CVE-2024-56139 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2024-56139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2024-56139?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-56139 have an EU (EUVD) identifier?

Yes. CVE-2024-56139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-52991.

When was CVE-2024-56139 published?

CVE-2024-56139 was published on 2024-12-17 and last updated on 2026-06-17.

CVE-2024-56139

CVE-2024-56139 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-52991
Weakness: CWE-121
Published: 2024-12-17
Last modified: 2026-06-17

Description

pdftools is a high level tools to convert PDF files to ePUB formats. In versions up to and including 0.5.0 maliciously crafted epub files can cause a stack overflow leading to a crash. This issue has not yet been addressed and users are advised to avoid untrusted input to their systems.

Frequently asked questions

What is CVE-2024-56139?: pdftools is a high level tools to convert PDF files to ePUB formats. In versions up to and including 0.5.0 maliciously crafted epub files can cause a stack overflow leading to a crash. This issue has not yet been addressed and users are advised to avoid untrusted input to their systems.
How severe is CVE-2024-56139?: CVE-2024-56139 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2024-56139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2024-56139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-56139 have an EU (EUVD) identifier?: Yes. CVE-2024-56139 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-52991.
When was CVE-2024-56139 published?: CVE-2024-56139 was published on 2024-12-17 and last updated on 2026-06-17.

References

https://github.com/leonhad/pdftools/security/advisories/GHSA-hgvf-4pf3-fwc9

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities

CVE-2026-12848 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12847 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12846 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12485 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-37541 — Critical (CVSS 10.0): Buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) 3.3.005. In canformat_gvret.cpp, the length…
CVE-2026-42996 — Critical (CVSS 10.0): JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a stack-based buffer overflow via a radio transmission of…

Browse all CWE-121 (Stack-based Buffer Overflow) vulnerabilities →