CVE-2026-113792: py-pdf pypdf Infinite Loop
CVSS: 6.0v4.0MediumReceived
AliasesGHSA-qfv9-64jg-mh7pCGA-cjf5-wmqc-q9vjCGA-q632-m2xh-6r3gCGA-2rwp-wmhr-996mCGA-3fjf-p27p-5w99CGA-4f3j-jwpc-p9mm
Published 21-10-2026Last modified 21-10-2026
Vulnerability summary
CVE-2026-113792 is a medium (CVSS 6.0) Infinite Loop 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 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
CVSS metrics
5 scores · 5 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 5 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
- OSV · PypiEcosystem advisory · calculated6.0MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · WolfiEcosystem advisory · calculated6.0MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated6.0MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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 causeAffected systems
Chainguard3 products
- litellmAll versions (No fix recorded)
- litellm-fipsAll versions (No fix recorded)
- open-webuiAll versions (No fix recorded)
Py-pdf1 product
- pypdf< 6.20.1
PyPI1 product
- pypdf< 6.20.1
Wolfi1 product
- open-webuiAll versions (No fix recorded)
4 vendors · 6 products
References
5 links- github.com/py-pdf/pypdfPACKAGE