High 8.7Published Sep 30, 2026

CVE-2026-102995pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

Updated under an hour ago (2026-10-19 06:10 UTC)

Does this affect you?

It affects py-pdf pypdf and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.34%, higher than 26% of scored CVEs.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for py-pdf pypdf

Exploited in the last 30 days

pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extraction and consume excessive memory. This is a second follow-up to earlier /ToUnicode resource-consumption fixes and is limited to the remaining token-length path. This issue is fixed in version 6.18.1.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.34% (percentile 26)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

py-pdf pypdf py_pdf:pypdf (from the name)	before 6.18.1	CNA record
pypdf_project pypdf pypdf_project:pypdf	before 6.18.1	NVD

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvfx-refsource-confirm, vendor-advisory
https://github.com/py-pdf/pypdf/pull/4071x-refsource-misc, patch, issue-tracking
https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51x-refsource-misc, patch
https://github.com/py-pdf/pypdf/releases/tag/6.18.1x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.