CVE-2026-113789: py-pdf pypdf Uncontrolled Resource Consumption
CVSS: 6.0v4.0MediumReceived
Published 21-10-2026Last modified 21-10-2026
Vulnerability summary
CVE-2026-113789 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 that causes large memory usage or long runtimes when an application retrieves the document's form fields. 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-407Inefficient Algorithmic ComplexityAn algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
Affected systems
Py-pdf1 product
- pypdf< 6.21.0
1 vendor · 1 product
References
4 links- github.com/py-pdf/pypdf/security/advisories/GHSA-6vvc-x485-93v7X Refsource CONFIRM
- github.com/py-pdf/pypdf/pull/4219X Refsource MISC
- github.com/py-pdf/pypdf/releases/tag/6.21.0X Refsource MISC