EUVD-2026-42344Severity by source
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: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
Network-reachable via PDF submission, no privileges or interaction needed; availability impact is Low given 'long runtimes' rather than full crash.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
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: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
Lifecycle Timeline
2DescriptionCVE.org
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.
AnalysisAI
Uncontrolled resource consumption in pypdf prior to 6.14.0 allows unauthenticated remote attackers to cause denial of service by submitting a crafted PDF containing repeated malformed cross-reference streams. The library's XRef table recovery routine performs unbounded work on such inputs, leading to excessive CPU time consumption and effectively hanging or severely degrading any application that processes attacker-supplied PDFs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The application must use pypdf to parse attacker-supplied PDF files - for example, accepting PDF uploads via a file upload endpoint, processing email attachments, or reading PDFs from user-controlled storage paths. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:L) scores 6.9 (Medium), reflecting network-reachable, zero-complexity exploitation with no privileges required, but only low availability impact on the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker targeting a web application that accepts PDF uploads - such as a document converter, invoice processor, or form handler - submits a specially crafted PDF containing dozens of repeated, intentionally malformed cross-reference streams. When the application passes the file to pypdf for parsing, the library's XRef recovery loop runs indefinitely or for an extremely long duration, monopolizing the worker thread or process. … |
| Remediation | Upgrade pypdf to version 6.14.0 or later, which resolves this issue via the fix in commit b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae (PR #3887). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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