Low severity · published Jun 22, 2026
CVE-2026-49460
pypdf: Inefficient decoding of FlateDecode PNG predictor streams
3.3
CVSS
0.2%
EPSS
No
On KEV
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PY
pypdf · py-pdf
< 6.12.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49460
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49460
Issue Tracking
https://github.com/py-pdf/pypdf/pull/3806
Patch
https://github.com/py-pdf/pypdf/releases/tag/6.12.2
Patch
https://github.com/py-pdf/pypdf/security/advisories/GHSA-5hgr-hg42-57jg
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