EUVD-2026-38356
GHSA-j543-4vmf-qm7v
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/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
Network-delivered PDF triggers memory exhaustion with no authentication or user interaction required; only availability is impacted.
Primary rating from Vendor (https://github.com/py-pdf/pypdf).
CVSS VectorVendor: https://github.com/py-pdf/pypdf
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/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
Lifecycle Timeline
3Blast Radius
ecosystem impact- 2 pypi packages depend on pypdf (2 direct, 0 indirect)
Ecosystem-wide dependent count for version 6.12.2.
DescriptionCVE.org
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting the text of a page which contains a form XObject with self-references.
Patches
This has been fixed in pypdf==6.12.2.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3805.
AnalysisAI
Uncontrolled resource consumption in pypdf versions before 6.12.2 allows any attacker who can cause an application to call extract_text() on a crafted PDF to trigger unbounded memory growth, resulting in denial of service. The vulnerability arises specifically during form XObject traversal: a PDF containing a self-referencing XObject resource dictionary causes the extraction code to recurse infinitely without cycle detection. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the vulnerable application calls `extract_text()` (or internally calls `extract_xform_text()`) on a page from an attacker-supplied PDF, and that the PDF contains a form XObject with a self-referential or cyclic entry in its `/Resources /XObject` dictionary. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | No CVSS vector or EPSS score was provided in the source data, so risk metrics are independently assessed rather than sourced from NVD or vendor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker uploads a crafted PDF to a document processing web application that uses pypdf to index page text. The PDF contains a form XObject whose `/Resources /XObject` dictionary includes a self-reference, causing `page.extract_text()` to recurse without bound. … |
| Remediation | Upgrade to pypdf 6.12.2 or later, released at https://github.com/py-pdf/pypdf/releases/tag/6.12.2 - this is the definitive fix. … 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
View allVendor StatusVendor
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External POC / Exploit Code
Leaving vuln.today