High severity · published Sep 30, 2026
CVE-2026-102995
pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extraction and consume excessive memory. This is a second follow-up to earlier /ToUnicode resource-consumption fixes and is limited to the remaining token-length path. This issue is fixed in version 6.18.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PY
pypdf · py-pdf
< 6.18.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102995
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102995
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf
x_refsource_MISC
https://github.com/py-pdf/pypdf/pull/4071
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51
x_refsource_MISC
https://github.com/py-pdf/pypdf/releases/tag/6.18.1
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