CVE-2026-33123 (GCVE-0-2026-33123)
Vulnerability from cvelistv5
Published
2026-03-20 09:09
Modified
2026-03-20 18:07
Severity ?
5.1 (Medium) - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-407 - Inefficient Algorithmic Complexity
Summary
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.
References
Impacted products
Vendor Product Version
py-pdf pypdf Version: < 6.9.1
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                "id": "CVE-2026-33123",
                "options": [
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                    "Exploitation": "none"
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      "metrics": [
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          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
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      "references": [
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          "name": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp",
          "tags": [
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          "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-qpxp-75px-xjcp"
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    "dateReserved": "2026-03-17T20:35:49.926Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
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