CVE-2026-27026
Last modified
CVE-2026-27026 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Pypdf Project | Pypdf | < 6.7.1 |
References
- https://github.com/py-pdf/pypdf/pull/3644Issue Tracking, Patch
- https://github.com/py-pdf/pypdf/releases/tag/6.7.1Product, Release Notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mvc-8737-8j8hPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-27026?
How severe is CVE-2026-27026?
How do I fix CVE-2026-27026?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-27020Photobooth prior to 1.0.1 has a cross-site scripting (XSS) v…5.3
- CVE-2026-27021Discourse is an open source discussion platform. Prior to ve…5.3
- CVE-2026-27022@langchain/langgraph-checkpoint-redis is the Redis checkpoin…6.5
- CVE-2026-27023Twenty is an open source CRM. Prior to version 1.18, the SSR…5
- CVE-2026-27024pypdf is a free and open-source pure-python PDF library. Pri…5.5
- CVE-2026-27025pypdf is a free and open-source pure-python PDF library. Pri…5.5
- CVE-2026-27027Charging station authentication identifiers are publicly acc…6.9
- CVE-2026-27028WebSocket endpoints lack proper authentication mechanisms, e…9.8
- CVE-2026-2703A weakness has been identified in xlnt-community xlnt up to …5.5
- CVE-2026-27031Rejected reason: Not used
- CVE-2026-27032Rejected reason: Not used
- CVE-2026-27033Rejected reason: Not used
Are you affected by CVE-2026-27026?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST