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pypdf CVE-2026-57204

| EUVDEUVD-2026-40425 MEDIUM
Uncontrolled Resource Consumption (CWE-400)
2026-06-30 security-advisories@github.com
Python Denial Of Service Pypdf
6.9
CVSS 4.0 · Vendor: github
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Severity by source

Vendor (github) PRIMARY
6.9 MEDIUM
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
vuln.today AI
5.3 MEDIUM

Unauthenticated network-reachable delivery (PR:N, AV:N, AC:L); availability impact rated L consistent with partial memory exhaustion rather than a guaranteed full-crash outcome per CVSS 4.0 VA:L signal.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (github).

CVSS VectorVendor: github

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jun 30, 2026 - 23:01 EUVD
Analysis Generated
Jun 30, 2026 - 22:31 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 5 pypi packages depend on pypdf (5 direct, 0 indirect)

Ecosystem-wide dependent count for version 6.13.3.

DescriptionCVE.org

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.

AnalysisAI

Memory exhaustion in pypdf prior to 6.13.3 allows unauthenticated remote attackers to cause denial of service by supplying a maliciously crafted PDF. The MAX_DECLARED_STREAM_LENGTH safety cap - designed to bound memory allocation during stream parsing - is bypassed when a PDF content stream omits the /Length value, enabling unbounded memory growth. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft PDF with /Length-less content stream
Delivery
Deliver PDF to pypdf-consuming application
Exploit
Application invokes pypdf content stream parser
Execution
MAX_DECLARED_STREAM_LENGTH bypass triggers unbounded memory allocation
Impact
Memory exhaustion degrades or crashes target process
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application pass an attacker-supplied PDF to pypdf's parser - for example, via a web file upload endpoint, an email attachment processor, a document conversion service, or a pipeline that fetches remote PDFs. … 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 reflects a low-complexity, unauthenticated, network-reachable attack - any application that accepts attacker-controlled PDFs can be targeted without special conditions. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted PDF file - containing a content stream with no /Length field - to a web application or automated document processor built on pypdf. When pypdf parses the stream, it allocates memory without bound, progressively exhausting available RAM. …
Remediation Upgrade pypdf to version 6.13.3 or later, which enforces MAX_DECLARED_STREAM_LENGTH even when a content stream lacks a /Length entry; the patch and release notes are available at https://github.com/py-pdf/pypdf/releases/tag/6.13.3. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-57204 vulnerability details – vuln.today
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