GHSA-mfr5-77xh-9j7h

Suggest an improvement
Source
https://github.com/advisories/GHSA-mfr5-77xh-9j7h
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mfr5-77xh-9j7h/GHSA-mfr5-77xh-9j7h.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-mfr5-77xh-9j7h
Aliases
Published
2026-10-30T23:12:20Z
Modified
2026-10-30T23:30:04Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
pypdf has possible infinite loop when cloning dictionaries
Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires cloning/duplicating a DictionaryObject.

Patches

This has been fixed in pypdf==6.21.4.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4288.

Database specific 
{
    "cwe_ids":  [
        "CWE-835"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-30T23:12:20Z",
    "nvd_published_at":  "2026-10-29T21:17:19Z",
    "severity":  "HIGH"
}
References

Affected packages

PyPI / pypdf

Package

Name
pypdf
View open source insights on deps.dev
Purl
pkg:pypi/pypdf

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
6.21.4

Affected versions

1.*
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.12
1.13
3.*
3.1.0
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
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
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
6.9.1
6.9.2
6.10.0
6.10.1
6.10.2
6.11.0
6.12.0
6.12.1
6.12.2
6.13.0
6.13.1
6.13.2
6.13.3
6.14.0
6.14.1
6.14.2
6.15.0
6.16.0
6.16.1
6.16.2
6.17.0
6.18.0
6.18.1
6.19.0
6.20.0
6.20.1
6.21.0
6.21.1
6.21.2
6.21.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-mfr5-77xh-9j7h/GHSA-mfr5-77xh-9j7h.json"