CVE-2021-25292
MEDIUM6.5EPSS 0.18%Regular Expression Denial of Service (ReDoS) in Pillow
Published: 3/29/2021Modified: 4/28/2026
Description
An issue was discovered in Pillow before 8.1.1. The PDF parser allows a regular expression DoS (ReDoS) attack via a crafted PDF file because of a catastrophic backtracking regex.
Affected packages (5)
- Alpine/py3-pillowfrom 0, < 8.1.2-r0
- Bitnami/pillowfrom 0, < 8.1.1
- Debian/pillowfrom 0, < 8.1.1-1
- PyPI/pillow>= 5.1.0, < 8.1.1
- PyPI/pillowfrom 0, < 8.1.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
References (11)
- ADVISORYhttps://github.com/advisories/GHSA-9hx2-hgq2-2g4f
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-25292
- ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2021-25292
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-25292
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-38.yaml
- WEBhttps://github.com/python-pillow/Pillow
- WEBhttps://github.com/python-pillow/Pillow/commit/3bce145966374dd39ce58a6fc0083f8d1890719c
- WEBhttps://github.com/python-pillow/Pillow/commit/521dab94c7ab72b037bd9a83e9663401e0fd2cee
- WEBhttps://github.com/python-pillow/Pillow/commit/6207b44ab1ff4a91d8ddc7579619876d0bb191a4
- WEBhttps://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html
- WEBhttps://security.gentoo.org/glsa/202107-33