CVE-2025-55197
HIGH7.5EPSS 0.16%PyPDF's Manipulated FlateDecode streams can exhaust RAM
Published: 8/13/2025Modified: 2/4/2026
Description
### Impact An attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. ### Patches This has been fixed in [pypdf==6.0.0](https://github.com/py-pdf/pypdf/releases/tag/6.0.0). ### Workarounds If you cannot upgrade yet, you might want to implement the workaround for `pypdf.filters.decompress` yourself: https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143 ### References This issue has been reported in #3429 and fixed in #3430.
Affected packages (3)
- Debian/pypdffrom 0
- Debian/pypdf2from 0
- PyPI/pypdffrom 0, < 6.0.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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/E:U |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (8)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-55197
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2025-55197
- PATCHhttps://github.com/py-pdf/pypdf
- WEBhttps://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143
- WEBhttps://github.com/py-pdf/pypdf/issues/3429
- WEBhttps://github.com/py-pdf/pypdf/pull/3430
- WEBhttps://github.com/py-pdf/pypdf/releases/tag/6.0.0
- WEBhttps://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m