CVE-2026-33699
pypdf: Possible infinite loop during recovery attempts in DictionaryObject.read_from_stream
Description
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
Red Hat Inc.
commercial·USaka red hat
py-pdf
package-ecosystemaka pypdf, pypdf2
pypdfOn-prem
OSS Libraries / pypiООО «Ред Софт»
commercial·RUaka red soft
pypdf project
oss-project
Exploitability
Official Patch Available
Attack Graph
Products CVE Techniques Tactics
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MITRE ATT&CK
1 technique Impact
References
https://github.com/py-pdf/pypdf/security/advisories/GHSA-87mj-5ggw-8qc3
github.com
https://github.com/py-pdf/pypdf/pull/3693
github.com
https://github.com/py-pdf/pypdf/releases/tag/6.9.2
github.com
and 6 more references View all →
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