CVE-2026-49460
published 2026-06-22CVE-2026-49460: 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…
PriorityP412low3.3CVSS 3.1
AVLACLPRLUINSUCNINAL
EPSS
0.12%
1.9th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| py-pdf | pypdf | < 6.12.2 | 6.12.2 |
| pypdf_project | pypdf | < 6.12.2 | 6.12.2 |
| pypdf_project | pypdf | >= 0 < 6.12.2 | 6.12.2 |
CVSS provenance
nvdv3.13.3LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
nvdv4.05.1MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat3.3LOW
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Red Hat
pypdf: pypdf: Denial of Service via crafted PDF with FlateDecode filter
vendor_redhat·2026-06-22·CVSS 3.3
CVE-2026-49460 [LOW] CWE-770 pypdf: pypdf: Denial of Service via crafted PDF with FlateDecode filter
pypdf: pypdf: Denial of Service via crafted PDF with FlateDecode filter
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.
A flaw was found in pypdf (before 6.12.2). A crafted PDF that accesses a stream using the /FlateDecode filter with a PNG predictor can trigger excessively long processing times, leading to denial of service when the document is parsed.
Statement: pypdf is vulnerable to denial of service when parsing a crafted PDF containing a /FlateDecode stream with a PNG predictor. An attacker who can supply such a document for processing may caus
GHSA
pypdf: Inefficient decoding of FlateDecode PNG predictor streams
ghsa·2026-06-16
CVE-2026-49460 [MEDIUM] CWE-407 pypdf: Inefficient decoding of FlateDecode PNG predictor streams
pypdf: Inefficient decoding of FlateDecode PNG predictor streams
### Impact
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.
### Patches
This has been fixed in [pypdf==6.12.2](https://github.com/py-pdf/pypdf/releases/tag/6.12.2).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3806](https://github.com/py-pdf/pypdf/pull/3806).
No detection rules found.
No public exploits indexed.
2026-06-22
Published