GHSA-r73j-pqj5-w3x7

Source

https://github.com/advisories/GHSA-r73j-pqj5-w3x7

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-r73j-pqj5-w3x7/GHSA-r73j-pqj5-w3x7.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-r73j-pqj5-w3x7

Aliases

Downstream

CGA (6)

ECHO (1)

ECHO-55b6-3b95-3506

MINI (5)

Published

2026-05-04T20:19:30Z

Modified

2026-09-10T03:50:55Z

Severity

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

Summary

Pillow has a PDF Parsing Trailer Infinite Loop (DoS)

Details

Impact

An attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive.

Patches

Patched version: 12.2.0.

PdfParser (introduced in Pillow 4.2.0) follows Prev pointers in PDF trailers to read cross-reference sections. If a trailer's Prev pointer references an offset that has already been processed — either pointing to itself or forming a longer cycle — the parser enters an infinite loop. Pillow now tracks previously processed trailer offsets and raises an error if a cycle is detected.

Workarounds

Use any version but the affected versions: >= 4.2.0, < 12.2.0

Resources

Fix: https://github.com/python-pillow/Pillow/pull/9519

Database specific

{
    "cwe_ids":  [
        "CWE-835"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-04T20:19:30Z",
    "nvd_published_at":  "2026-05-09T06:16:10Z",
    "severity":  "MODERATE"
}

References

Affected packages

PyPI / pillow

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

4.2.0

Fixed

12.2.0

Affected versions

4.*

4.2.0

4.2.1

4.3.0

5.*

5.0.0

5.1.0

5.2.0

5.3.0

5.4.0.dev0

5.4.0

5.4.1

6.*

6.0.0

6.1.0

6.2.0

6.2.1

6.2.2

7.*

7.0.0

7.1.0

7.1.1

7.1.2

7.2.0

8.*

8.0.0

8.0.1

8.1.0

8.1.1

8.1.2

8.2.0

8.3.0

8.3.1

8.3.2

8.4.0

9.*

9.0.0

9.0.1

9.1.0

9.1.1

9.2.0

9.3.0

9.4.0

9.5.0

10.*

10.0.0

10.0.1

10.1.0

10.2.0

10.3.0

10.4.0

11.*

11.0.0

11.1.0

11.2.1

11.3.0

12.*

12.0.0

12.1.0

12.1.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-r73j-pqj5-w3x7/GHSA-r73j-pqj5-w3x7.json"