CVE-2026-33123

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Source
https://cve.org/CVERecord?id=CVE-2026-33123
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33123.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33123
Aliases
Downstream
CGA (4)
CLSA (1)
DEBIAN (1)
ECHO (1)
MINI (2)
openSUSE (3)
ROOT (1)
UBUNTU (1)
Related
openSUSE (2)
Published
2026-03-20T09:09:12Z
Modified
2026-11-04T02:47:33Z
Severity
  • 5.1 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
pypdf has inefficient decoding of array-based streams
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400",
        "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33123.json"
}
References

Affected packages

Git / github.com/py-pdf/pypdf

Affected ranges

Type
GIT
Repo
https://github.com/py-pdf/pypdf
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0e5157c2d9440c3594de43ffe27745eb474a2fb9
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "6.9.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "original_tag": "6.9.1",
            "range": [
                {
                    "fixed": "0e5157c2d9440c3594de43ffe27745eb474a2fb9"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "cpe": "cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "6.9.1"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}

Affected versions

1.*
1.26.0
1.27.0
1.27.1
1.27.10
1.27.11
1.27.12
1.27.2
1.27.3
1.27.4
1.27.5
1.27.6
1.27.7
1.27.8
1.27.9
1.28.0
1.28.1
1.28.2
2.*
2.0.0
2.1.0
2.1.1
2.10.0
2.10.1
2.10.2
2.10.3
2.10.4
2.10.5
2.10.6
2.10.7
2.10.8
2.10.9
2.11.0
2.11.1
2.11.2
2.12.0
2.12.1
2.2.0
2.2.1
2.3.0
2.3.1
2.4.0
2.4.1
2.4.2
2.5.0
2.6.0
2.7.0
2.8.0
2.8.1
2.9.0
3.*
3.0.0
3.1.0
3.10.0
3.11.0
3.11.1
3.12.0
3.12.1
3.12.2
3.13.0
3.14.0
3.15.0
3.15.1
3.15.2
3.15.3
3.15.4
3.15.5
3.16.0
3.16.1
3.16.2
3.16.3
3.16.4
3.17.0
3.17.1
3.17.2
3.17.3
3.17.4
3.2.0
3.2.1
3.3.0
3.4.0
3.4.1
3.5.0
3.5.1
3.5.2
3.6.0
3.7.0
3.7.1
3.8.0
3.8.1
3.9.0
3.9.1
4.*
4.0.0
4.0.1
4.0.2
4.1.0
4.2.0
4.3.0
4.3.1
5.*
5.0.0
5.0.1
5.1.0
5.2.0
5.3.0
5.3.1
5.4.0
5.5.0
5.6.0
5.6.1
5.7.0
5.8.0
5.9.0
6.*
6.0.0
6.1.0
6.1.1
6.1.2
6.1.3
6.2.0
6.3.0
6.4.0
6.4.1
6.4.2
6.5.0
6.6.0
6.6.1
6.6.2
6.7.0
6.7.1
6.7.2
6.7.3
6.7.4
6.7.5
6.8.0
6.9.0
v1.*
v1.17
v1.18
v1.19
v1.20
v1.21
v1.22
v1.23
v1.24
v1.25
v1.25.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33123.json"