Medium
pypdf, pypdf2 — security advisory
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions 3.7.0 through 3.16.4 can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case when the pypdf-user manipulates an incoming malicious PDF e.g. by merging it with another PDF or by adding annotations. The issue was fixed in version 3.17.0. As a workaround, apply the patch manually by modifying `pypdf/generic/_data_structures.py`.
- Products
- pypdf, pypdf2
- Affected versions
- 1.23+git20141008-1, 1.25.1-1, 1.25.1-1ubuntu0.1~esm1, 1.25.1-1ubuntu0.1~esm2, 1.26.0-2, 1.26.0-2ubuntu0.1~esm1, 1.26.0-2ubuntu0.1~esm2, 1.26.0-3ubuntu1, 1.26.0-3ubuntu1.20.04.1, 1.26.0-3ubuntu1.20.04.2, 1.26.0-4, 1.26.0-4ubuntu0.22.04.1, 1.26.0-4ubuntu0.22.04.2, 2.12.1-3, 2.12.1-4, 3.17.4-1, 3.4.1-1, 4.0.0-1, 4.0.1-1, 4.0.2-1, 4.3.1-1, 5.4.0-1, 6.9.2-1, 6.9.2-2
- Fixed versions
- Not specified
- CVEs
- CVE-2023-46250
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:05 UTC · Revision 1
Source evidence
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions 3.7.0 through 3.16.4 can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case when the pypdf-user manipulates an incoming malicious PDF e.g. by merging it with another PDF or by adding annotations. The issue was fixed in version 3.17.0. As a workaround, apply the patch manually by modifying `pypdf/generic/_data_structures.py`.
osv:UBUNTU-CVE-2023-46250
pypdf2
Fixed versions: Not specified
pypdf2
Fixed versions: Not specified
pypdf2
Fixed versions: Not specified
pypdf2
Fixed versions: Not specified
pypdf
Fixed versions: Not specified
pypdf2
Fixed versions: Not specified
pypdf
Fixed versions: Not specified
pypdf
Fixed versions: Not specified
pypdf
Fixed versions: Not specified
Complete source record
{
"id": "024c3eccc35090ef9c22a7ecf6b5c870aa04f3078ba3a1d96a0b687a9fd1693e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2023-46250",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2023-46250",
"summary": "pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions 3.7.0 through 3.16.4 can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case when the pypdf-user manipulates an incoming malicious PDF e.g. by merging it with another PDF or by adding annotations. The issue was fixed in version 3.17.0. As a workaround, apply the patch manually by modifying `pypdf/generic/_data_structures.py`.",
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"modified": "2026-10-17T12:56:25.895662336Z",
"provider": "osv",
"upstream": [
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"references": [
"https://ubuntu.com/security/CVE-2023-46250",
"https://github.com/py-pdf/pypdf/security/advisories/GHSA-wjcc-cq79-p63f",
"https://github.com/py-pdf/pypdf/pull/2264",
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]
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"evidence": "/upstream"
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"source_id": "core-osv",
"document_id": 355647,
"published_at": "2023-10-31T16:15:00+00:00"
}