GHSA-4pxv-j86v-mhcw

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
6.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

pypdf: Possible long runtimes for wrong size values in incremental mode

Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer /Size value in incremental mode.

Patches

This has been fixed in pypdf==6.10.2.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #3735.

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T21:30:12Z",
    "nvd_published_at": "2026-04-22T22:16:32Z",
    "severity": "MODERATE",
    "cwe_ids": [
        "CWE-834"
    ]
}

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

0Unknown introduced version / All previous versions are affected

Fixed

6.10.2

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

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-4pxv-j86v-mhcw/GHSA-4pxv-j86v-mhcw.json"