Is CVE-2026-115585 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-115585 being exploited in the wild.

How severe is CVE-2026-115585?

High severity, with a CVSS score of 4, published 23 October 2026.

Which products and versions are affected?

Py-Pdf Pypdf prior to 6.21.2; pypdf (PyPI) < 6.21.2, ECOSYSTEM:introduced=0,fixed=6.21.2.

Is there a fix for CVE-2026-115585?

Yes. pypdf (PyPI): upgrade to 6.21.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-115585 attacked?

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

Am I affected by CVE-2026-115585?

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-2026-115585: pypdf incomplete remediation causing excessive PDF stream reloads

Q: Is there a fix for CVE-2026-115585?

Yes. pypdf (PyPI): upgrade to 6.21.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-115585 attacked?

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

Q: Am I affected by CVE-2026-115585?

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-2026-115585 · Severity: high · CVSS 4 · Published 2026-10-23

pypdf is a Python library for reading and manipulating PDF files. A flaw in its handling of malformed PDF cross-reference data causes the library to repeatedly reload entire PDF files during error recovery, which can result in excessively long processing times when processing specially crafted PDFs.

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

Quick answers

Is CVE-2026-115585 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-115585 being exploited in the wild.
How severe is CVE-2026-115585?: High severity, with a CVSS score of 4, published 23 October 2026.
Which products and versions are affected?: Py-Pdf Pypdf prior to 6.21.2; pypdf (PyPI) < 6.21.2, ECOSYSTEM:introduced=0,fixed=6.21.2.
Is there a fix for CVE-2026-115585?: Yes. pypdf (PyPI): upgrade to 6.21.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-115585 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-115585?: 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 6.21.2 or later
```
pip install "pypdf>=6.21.2"
```

Technical details

The vulnerability is an incomplete remediation for handling repeated malformed cross-reference entries (CVE-2026-115585 references GHSA-55h5-xmcq-c37v). Even when a recovery cache is present, the library still triggers a complete PDF stream reload on each recovery attempt, leading to algorithmic complexity attacks. The fix involves caching invalid object lookups and reading the cross-reference table buffer only once during recovery.

Affected products

py-pdf pypdf prior to 6.21.2

Identifiers

CVE-2026-115585
GHSA-jr96-gvgh-j3r4

Timeline

2026-10-23: disclosed
2026-10-21: patched

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.