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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-27026

CVE-2026-27026

MEDIUM6.9

pypdf possibly has long runtimes for malformed FlateDecode streams

Published Feb 20, 2026

Modified 1 weeks ago

Details

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.

References

https://github.com/py-pdf/pypdf/commit/7905842d833f899f1d3228af7e7467ad80277016

https://github.com/py-pdf/pypdf/pull/3644

https://github.com/py-pdf/pypdf/releases/tag/6.7.1

https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8h

https://www.cve.org/CVERecord?id=CVE-2026-27026

CVSS Analysis

CVSS v4.0

6.9

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Attack Requirements

NoneAT:N

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Vulnerable System

Vuln. Confidentiality

NoneVC:N

Vuln. Integrity

NoneVI:N

Vuln. Availability

HighVA:H

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

6.9/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

Weakness Type (CWE)

Resource Management

Allocation without Limits

Ecosystems

Timeline

PublishedFeb 20, 2026

ModifiedFeb 24, 2026

CVE-2026-27026 | Mondoo Vulnerability Intelligence