Is CVE-2026-102995 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-102995 being exploited in the wild.

How severe is CVE-2026-102995?

High severity, with a CVSS score of 4, published 30 September 2026.

Which products and versions are affected?

Py-Pdf Pypdf prior to 6.18.1; pypdf (PyPI) < 6.18.1, ECOSYSTEM:introduced=0,fixed=6.18.1.

Is there a fix for CVE-2026-102995?

Yes. pypdf (PyPI): upgrade to 6.18.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-102995 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-102995?

Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-102995: pypdf memory exhaustion in ToUnicode font mapping parsing

Q: Is there a fix for CVE-2026-102995?

Yes. pypdf (PyPI): upgrade to 6.18.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-102995 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-102995?

Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-102995 · Severity: high · CVSS 4 · Published 2026-09-30

pypdf is a Python library for reading and manipulating PDF files. A malicious PDF can exploit improper token length validation in font ToUnicode mapping parsing to consume excessive memory during operations like text extraction, potentially causing denial of service.

Technologies: Py-Pdf Pypdf, pypdf (PyPI). Vendors: Py-Pdf, PyPI.

Quick answers

Is CVE-2026-102995 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-102995 being exploited in the wild.
How severe is CVE-2026-102995?: High severity, with a CVSS score of 4, published 30 September 2026.
Which products and versions are affected?: Py-Pdf Pypdf prior to 6.18.1; pypdf (PyPI) < 6.18.1, ECOSYSTEM:introduced=0,fixed=6.18.1.
Is there a fix for CVE-2026-102995?: Yes. pypdf (PyPI): upgrade to 6.18.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-102995 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-102995?: Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

pypdf (PyPI): upgrade to 6.18.1 or later
```
pip install "pypdf>=6.18.1"
```

Technical details

The vulnerability exists in pypdf/_cmap.py's parse_bfchar function, which fails to properly limit the length of tokens decoded from PDF font /ToUnicode mappings. An attacker can craft a PDF with oversized source-code or destination-string tokens that cause the parser to retain excessive memory. The flaw is triggered during PDF parsing without requiring user interaction beyond opening the file.

Affected products

py-pdf pypdf prior to 6.18.1

Identifiers

CVE-2026-102995
GHSA-fp3h-c4fm-7vvf
PYSEC-2026-4154

Timeline

2026-09-30: disclosed
2026-09-11: patched

References

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