What is CVE-2025-26240?

CVE-2025-26240 is a high-severity vulnerability in N/a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.4/10. Published 2026-06-17.

How severe is CVE-2025-26240?

High severity. CVSS v3 base score is 8.4 out of 10.

Is CVE-2025-26240 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in N/a

CVE-2025-26240

In JazzCore python-pdfkit 1.0.0, the from_string method enables the execution of JavaScript code within the context of the server application and the exfiltration of local files.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

Habuon/CVE-2025-26240

References

Frequently asked questions

What is CVE-2025-26240?: CVE-2025-26240 is a high-severity vulnerability in N/a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.4/10. Published 2026-06-17.
How severe is CVE-2025-26240?: High severity. CVSS v3 base score is 8.4 out of 10.
Is CVE-2025-26240 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.