GHSA-jw7q-gvrg-4vj3

Source

https://github.com/advisories/GHSA-jw7q-gvrg-4vj3

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-jw7q-gvrg-4vj3/GHSA-jw7q-gvrg-4vj3.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-jw7q-gvrg-4vj3

Aliases

Downstream

CGA (1)

CGA-qr5f-38f7-xr6v

ECHO (1)

ECHO-c89a-8658-9f90

MINI (14)

Published

2026-10-01T15:06:33Z

Modified

2026-10-01T17:56:11Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)

Details

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a partially malformed /FlateDecode stream, where the byte-by-byte decompression is used.

Patches

This has been fixed in pypdf==6.18.1.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4073.

Database specific

{
    "cwe_ids":  [
        "CWE-400",
        "CWE-407"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-10-01T15:06:33Z",
    "nvd_published_at":  "2026-09-30T21:17:07Z",
    "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

6.18.1

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

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-jw7q-gvrg-4vj3/GHSA-jw7q-gvrg-4vj3.json"