PYSEC-2026-4154
pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
At a glance
- Published
- Updated
- CVE
- CVE-2026-102995
- Aliases
- GHSA-fp3h-c4fm-7vvf
- 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
Description
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the `/ToUnicode` entry of a font with unusually large values, for example during text extraction. ### Patches This has been fixed in [pypdf==6.18.1](https://github.com/py-pdf/pypdf/releases/tag/6.18.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4071](https://github.com/py-pdf/pypdf/pull/4071).
Affected packages
| Package | Versions |
|---|---|
| PyPI · pypdf | introduced 0, fixed 6.18.1 |
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-102995 ADVISORY
- https://github.com/py-pdf/pypdf/pull/4071 WEB
- https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51 WEB
- https://github.com/py-pdf/pypdf PACKAGE
- https://github.com/py-pdf/pypdf/releases/tag/6.18.1 WEB
- https://pypi.org/project/pypdf PACKAGE
- https://github.com/advisories/GHSA-fp3h-c4fm-7vvf ADVISORY
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — PyPA Advisory Database |