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Pypdf CVE-2026-27026

MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-02-20 security-advisories@github.com GHSA-9mvc-8737-8j8h
Python Red Hat Pypdf Suse Pypdf Project
5.5
CVSS 3.1 · GitHub Advisory
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Vulnerability Assessment

Weakness
CWE
CWE-770
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource allocation limits
MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS 5.5 (MEDIUM). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None.
Exploit ScenarioDerived

An attacker could exploit this flaw, long runtimes.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Pypdf versions up to 6.7.1 is affected by allocation of resources without limits or throttling (CVSS 5.5).

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 6.7.1..

Affected Packages

pypi pypdf fix: 6.7.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in pypi

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

This vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affects Pypdf. pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

GitHub Advisory PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE MEDIUM
Red Hat 6.5 MEDIUM

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Patch released
Feb 24, 2026 - 15:13 nvd
Patch available
CVE Published
Feb 20, 2026 - 22:16 nvd
MEDIUM 5.5

DescriptionGitHub Advisory

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

Blast Radius

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

Ecosystem-wide dependent count for version 6.7.1.

Executive ViewAI

Why It Matters

Organizations using pypdf should be aware of moderate risk from CVE-2026-27026 rated CVSS 5.5. Exploitation could compromise the security of affected deployments. A patch is available and should be applied during regular vulnerability management.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 98% exploitable
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact
Low

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*

More in Pypdf

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CVE-2026-84309 MEDIUM POC
6.9 Sep 01

Infinite loop denial of service in pypdf prior to 6.16.0 allows any attacker who can supply a crafted PDF to a pypdf-bas
CVE-2026-54651 MEDIUM POC
6.9 Jun 22

Infinite loop denial-of-service in pypdf prior to 6.13.1 allows an attacker to hang any process that merges a crafted PD
CVE-2023-36810 MEDIUM POC
6.5 Jun 30

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. Rat
CVE-2023-36807 MEDIUM POC
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pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. Rat
CVE-2023-36464 MEDIUM POC
5.5 Jun 27

pypdf is an open source, pure-python PDF library. Rated medium severity (CVSS 5.5), this vulnerability is no authenticat
CVE-2026-84310 MEDIUM POC
4.8 Sep 01

Resource exhaustion in pypdf prior to 6.16.1 allows an attacker who can supply a crafted PDF to cause denial of service

CVE-2026-103000 HIGH
8.7 Sep 30

Memory exhaustion in pypdf versions prior to 6.19.0 allows a remote, unauthenticated attacker to make an application una
CVE-2026-102999 HIGH
8.7 Sep 30

Denial of service in pypdf versions prior to 6.19.0 allows an unauthenticated remote attacker to pin a PDF-processing wo
CVE-2026-102998 HIGH
8.7 Sep 30

Denial of service in pypdf versions prior to 6.19.0 allows remote, unauthenticated attackers to exhaust application CPU

CVE-2026-102997 HIGH
8.7 Sep 30

Denial of service in pypdf before 6.18.1 lets a crafted PDF drive the library's FlateDecode recovery path into inefficie
CVE-2026-102996 HIGH
8.7 Sep 30

Memory exhaustion in pypdf versions prior to 6.18.1 lets a crafted PDF force the library to allocate and process far mor
CVE-2026-102995 HIGH
8.7 Sep 30

Memory exhaustion in pypdf versions prior to 6.18.1 allows unauthenticated remote attackers to crash or degrade any appl

Same weakness CWE-770 – Allocation of Resources Without Limits or Throttling

View all
CVE-2017-8779 HIGH POC
7.5
CVE-2025-53521 CRITICAL POC
9.3
CVE-2024-28182 MEDIUM
5.3
CVE-2023-2650 MEDIUM
6.5
CVE-2017-5850 HIGH POC
7.5
CVE-2025-26682 HIGH
7.5
CVE-2022-32206 MEDIUM POC
6.5
CVE-2023-24998 HIGH
7.5

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Leap 16.0 Fixed
openSUSE Tumbleweed Fixed

References

Advisories & patches
PATCH https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016 PATCH https://github.com/py-pdf/pypdf/pull/3644 PATCH https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h ADVISORY https://vuldb.com/vuln/347228 REF https://github.com/py-pdf/pypdf/releases/tag/6.7.1

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