CVE-2026-113790: py-pdf pypdf Uncontrolled Resource Consumption
CVSS: 6.0v4.0MediumReceived
Published 21-10-2026Last modified 21-10-2026
Vulnerability summary
CVE-2026-113790 is a medium (CVSS 6.0) Uncontrolled Resource Consumption vulnerability in py-pdf pypdf.
CVSS score
6.0/10
010
Medium · v4.0 (CVE.org)EPSS score
Not scored
0%100%
No EPSS score yetKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 21-10-2026PublishedVulnerability first disclosed.
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing arrays or dictionaries with many elements, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.
CVSS metrics
2 scores · 2 sources · 1 versionMedium 6.0Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NSourcesAll 2 agree
- NVDNIST6.0MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS trend
No EPSS score has been published for this record yet.
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
- CWE-770Allocation of Resources Without Limits or ThrottlingThe product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Affected systems
Py-pdf1 product
- pypdf< 6.21.0
1 vendor · 1 product
References
4 links- github.com/py-pdf/pypdf/security/advisories/GHSA-f54x-cmq8-qg57X Refsource CONFIRM
- github.com/py-pdf/pypdf/pull/4218X Refsource MISC
- github.com/py-pdf/pypdf/releases/tag/6.21.0X Refsource MISC