CVE-2026-102999 pypdf: Possible long runtimes with large amount of embedded files
Attackers can cause denial of service in applications using pypdf by providing crafted PDFs with many embedded files, leading to excessive processing time.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-102999?
CVE-2026-102999 is a high-severity denial of service vulnerability in Pypdf Project Pypdf, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF containing many embedded files can cause the dictionary-based attachments API in pypdf/_doc_common.py to reparse the full attachment list for each content lookup, producing repeated work and long runtimes when an application accesses the embedded-file mapping. This issue is fixed in version 6.19.0.
Which versions are affected by CVE-2026-102999?
3 open source packages ship an affected version, including pypdf. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pypdf PyPI | All versions | 6.19.0 |
pypdf PyPI | All versions | 6.19.0 |
pypdf PyPI | All versions | 6.19.0 |
Products include Pypdf Project Pypdf.
How do I fix CVE-2026-102999?
Upgrade pypdf to 6.19.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-102999 being exploited?
There is no known exploitation of CVE-2026-102999 in the wild and no public exploit code.
Other vulnerabilities in Pypdf Project Pypdf
- CVE-2026-102993 pypdf: Possible large memory usage when retrieving Roman page labels
- CVE-2026-102994 pypdf: Possible long runtimes/large memory usage when parsing indirect objects
- CVE-2026-102995 pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
- CVE-2026-102996 pypdf: Possible large memory usage when parsing font data
- CVE-2026-102997 pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)
Sources
Also known as DEBIAN-CVE-2026-102999, ECHO-71b1-4662-c625, GHSA-v247-6f48-mgcj, MINI-4j95-j3g5-xcmj, MINI-4p78-cfjr-94cg, MINI-53jg-phcv-5pcv and 15 more.