UBUNTU-CVE-2023-36807 (CVE-2023-36807)
Vulnerability from osv_ubuntu – Published: 2023-06-30 19:15 – Updated: 2025-07-16 05:09 – Source website
Withdrawn 2025-07-18
VLAI
Details
pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In version 2.10.5 an attacker who uses this vulnerability 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 if the user extracted metadata from such a malformed PDF. Versions prior to 2.10.5 throw an error, but do not hang forever. This issue was fixed with https://github.com/py-pdf/pypdf/pull/1331 which has been included in release 2.10.6. Users are advised to upgrade. Users unable to upgrade should modify PyPDF2/generic/_data_structures.py::read_object to an an error throwing case. See GHSA-hm9v-vj3r-r55m for details.
Severity
6.5 (Medium)
6.2 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python-pypdf2",
"binary_version": "1.25.1-1"
},
{
"binary_name": "python3-pypdf2",
"binary_version": "1.25.1-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "pypdf2",
"purl": "pkg:deb/ubuntu/pypdf2@1.25.1-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.25.1-1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.23+git20141008-1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "python-pypdf2",
"binary_version": "1.25.1-1ubuntu0.1~esm2"
},
{
"binary_name": "python3-pypdf2",
"binary_version": "1.25.1-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "pypdf2",
"purl": "pkg:deb/ubuntu/pypdf2@1.25.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.25.1-1ubuntu0.1~esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.23+git20141008-1",
"1.25.1-1",
"1.25.1-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python-pypdf2",
"binary_version": "1.26.0-2"
},
{
"binary_name": "python3-pypdf2",
"binary_version": "1.26.0-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "pypdf2",
"purl": "pkg:deb/ubuntu/pypdf2@1.26.0-2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.0-2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": []
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "python-pypdf2",
"binary_version": "1.26.0-2ubuntu0.1~esm2"
},
{
"binary_name": "python3-pypdf2",
"binary_version": "1.26.0-2ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "pypdf2",
"purl": "pkg:deb/ubuntu/pypdf2@1.26.0-2ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.0-2ubuntu0.1~esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.26.0-2",
"1.26.0-2ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python-pypdf2",
"binary_version": "1.26.0-3ubuntu1.20.04.1"
},
{
"binary_name": "python3-pypdf2",
"binary_version": "1.26.0-3ubuntu1.20.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "pypdf2",
"purl": "pkg:deb/ubuntu/pypdf2@1.26.0-3ubuntu1.20.04.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.0-3ubuntu1.20.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.26.0-2",
"1.26.0-3ubuntu1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-pypdf2",
"binary_version": "1.26.0-4ubuntu0.22.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "pypdf2",
"purl": "pkg:deb/ubuntu/pypdf2@1.26.0-4ubuntu0.22.04.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.0-4ubuntu0.22.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.26.0-4"
]
}
],
"aliases": [],
"details": "pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In version 2.10.5 an attacker who uses this vulnerability 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 if the user extracted metadata from such a malformed PDF. Versions prior to 2.10.5 throw an error, but do not hang forever. This issue was fixed with https://github.com/py-pdf/pypdf/pull/1331 which has been included in release 2.10.6. Users are advised to upgrade. Users unable to upgrade should modify `PyPDF2/generic/_data_structures.py::read_object` to an an error throwing case. See GHSA-hm9v-vj3r-r55m for details.",
"id": "UBUNTU-CVE-2023-36807",
"modified": "2025-07-16T05:09:30Z",
"published": "2023-06-30T19:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-36807"
},
{
"type": "REPORT",
"url": "https://github.com/py-pdf/pypdf/pull/1331"
},
{
"type": "REPORT",
"url": "https://github.com/py-pdf/pypdf/issues/1329"
},
{
"type": "REPORT",
"url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-36807"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-36807"
],
"withdrawn": "2025-07-18T16:54:32Z"
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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