🛡️ CVE-2026-22690 — pypdf

🟢 CVSS 2.0 — Low ✅ No Known Exploit CWE-400 OSV
2.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

pypdf has possible long runtimes for missing /Root object with large /Size values

Impact

An attacker who exploits this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected.

Patches

This has been fixed in [pypdf==6.6.0](https://github.com/py-pdf/pypdf/releases/tag/6.6.0).

Workarounds

```python

from pypdf import PdfReader, PdfWriter

# Instead of

reader = PdfReader("file.pdf")

# use the strict mode:

reader = PdfReader("file.pdf", strict=True)

# Instead of

writer = PdfWriter(clone_from="file.pdf")

# use an explicit strict reader:

writer = PdfWriter(clone_from=PdfReader("file.pdf", strict=True))

```

Resources

This issue has been fixed in #3594.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

CVE-2026-22690 is classified as CWE-400: Uncontrolled Resource Consumption. A request can consume memory, CPU or storage without limit, exhausting capacity for everyone else.

Affected software

CVE-2026-22690 is recorded against 1 package.

  • pypdf (fixed in 6.6.0)

Timeline and source

Published on 9 January 2026 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

CVE-2026-22690 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity LOW
CVSS Score 2.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
CWE CWE-400
Public Exploit ✅ No
Source OSV
Published 2026-01-09
Updated 2026-08-12
Modified 2026-07-07

Affected Packages

Software From version Fixed in
pypdf — 6.6.0

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