CVE-2026-28804
published 2026-03-06CVE-2026-28804: pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long…
PriorityP429medium5.3CVSS 3.1
AVNACLPRNUINSUCNINAL
EPSS
0.40%
31.7th percentile
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | pypdf | < pypdf 6.9.0-1 (forky) | pypdf 6.9.0-1 (forky) |
| debian | pypdf2 | < pypdf 6.9.0-1 (forky) | pypdf 6.9.0-1 (forky) |
| py-pdf | pypdf | < 6.7.5 | 6.7.5 |
| pypdf_project | pypdf | < 6.7.5 | 6.7.5 |
| pypdf_project | pypdf | >= 0 < 6.9.0-1 | 6.9.0-1 |
| pypdf_project | pypdf | >= 0 < 6.7.5 | 6.7.5 |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
nvdv4.06.9MEDIUMCVSS:4.0/AV:N/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
osv6.9MEDIUM
vendor_debian6.9MEDIUM
vendor_redhat6.9MEDIUM
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OSV
CVE-2026-28804: pypdf is a free and open-source pure-python PDF library
osv·2026-03-06·CVSS 6.9
CVE-2026-28804 [MEDIUM] CVE-2026-28804: pypdf is a free and open-source pure-python PDF library
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.
OSV
pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
osv·2026-03-02
CVE-2026-28804 [MEDIUM] pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
pypdf vulnerable to inefficient decoding of ASCIIHexDecode 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 `/ASCIIHexDecode` filter.
### Patches
This has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).
GHSA
pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
ghsa·2026-03-02
CVE-2026-28804 [MEDIUM] CWE-407 pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams
pypdf vulnerable to inefficient decoding of ASCIIHexDecode 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 `/ASCIIHexDecode` filter.
### Patches
This has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).
### Workarounds
If you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).
Red Hat
pypdf: pypdf: Denial of Service via crafted PDF with ASCIIHexDecode filter
vendor_redhat·2026-03-06·CVSS 6.9
CVE-2026-28804 [MEDIUM] CWE-770 pypdf: pypdf: Denial of Service via crafted PDF with ASCIIHexDecode filter
pypdf: pypdf: Denial of Service via crafted PDF with ASCIIHexDecode filter
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.
A flaw was found in pypdf, a pure-python PDF library. A remote attacker can exploit this vulnerability by crafting a malicious PDF file that utilizes the /ASCIIHexDecode filter. Processing this specially crafted PDF can lead to excessively long runtimes, resulting in a Denial of Service (DoS) for the application or system processing the file.
Mitigation: To mitigate this issue, avoid processing untrusted PDF documents with applicatio
Debian
CVE-2026-28804: pypdf - pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5,...
vendor_debian·2026·CVSS 6.9
CVE-2026-28804 [MEDIUM] CVE-2026-28804: pypdf - pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5,...
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.
Scope: local
bookworm: open
forky: resolved (fixed in 6.9.0-1)
sid: resolved (fixed in 6.9.0-1)
trixie: open
No detection rules found.
No public exploits indexed.
2026-03-06
Published