What is GHSA-wgvp-vg3v-2xq3?

GHSA-wgvp-vg3v-2xq3 is a security advisory published by GitHub Security Advisories with Medium severity. pypdf has possible long runtimes/large memory usage for large /ToUnicode streams

Which CVE IDs does GHSA-wgvp-vg3v-2xq3 cover?

GHSA-wgvp-vg3v-2xq3 covers the following CVE IDs: CVE-2026-27025. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-wgvp-vg3v-2xq3?

GHSA-wgvp-vg3v-2xq3 affects 1 product, including: pip/pypdf:\u003c 6.7.1.

GHSA-wgvp-vg3v-2xq3Medium

pypdf has possible long runtimes/large memory usage for large /ToUnicode streams

Vendor

GitHub Security Advisories

Published

February 18, 2026

Last Modified

February 23, 2026

🔗 CVE IDs covered (1)

CVE-2026-27025 →

📋 Description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction.

Patches

This has been fixed in pypdf==6.7.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3646.

🎯 Affected products1

pip/pypdf:< 6.7.1

🔗 References (6)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-wgvp-vg3v-2xq3
https://github.com/py-pdf/pypdf/pull/3646
https://github.com/py-pdf/pypdf/commit/77d7b8d7cfbe8dd179858dfa42666f73fc6e57a2
https://github.com/py-pdf/pypdf/releases/tag/6.7.1
https://nvd.nist.gov/vuln/detail/CVE-2026-27025
https://github.com/advisories/GHSA-wgvp-vg3v-2xq3