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Vulnerability record · CVE-2026-71870 · published 7 August 2026

CVE-2026-71870: Pypdf project pypdf uncontrolled resource consumption vulnerability

PPypdf Project · Pypdf

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause large memory consumption when pypdf/_cmap.py function parse_bfrange parses unusually large source-code or destination-string tokens in a font /ToUnicode CMap during text extraction. This issue is fixed in 6.15.0.

4.8 CVSS 4.0 Medium EPSS 0.13% · top 98.0% CWE-400 · Uncontrolled resource consumption
4.8CVSS 4.0 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
5 Oct 2026Last modified by NVD

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause large memory consumption when pypdf/_cmap.py function parse_bfrange parses unusually large source-code or destination-string tokens in a font /ToUnicode CMap during text extraction. This issue is fixed in 6.15.0.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa Patch
https://github.com/py-pdf/pypdf/pull/3944 Patch
https://github.com/py-pdf/pypdf/releases/tag/6.15.0 Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-71870), CISA KEV, FIRST EPSS (scores of 2026-10-07). This page is refreshed as NVD updates the record.