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CVE-2026-28804

21
FAUCET Score

CVE-2026-28804 is a denial-of-service vulnerability affecting pypdf, a pure-python PDF library, prior to version 6.7.5. An attacker can craft a malicious PDF document utilizing the /ASCIIHexDecode filter, leading to excessively long processing times when accessed. This vulnerability has a CVSSv4 score of 6.9 (Medium), indicating a network-based attack with low complexity and a potential impact of partial availability degradation. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.7.5CPE matchmatch criteria
cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.9MEDIUM

CVSS: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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
32.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 20th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

pippatch availablevia ghsa
Product: pypdfFixed in: 6.7.5

Vendor Advisories (1)

pipGHSA-9m86-7pmv-2852medium

pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams

Mar 2, 2026

References

github.com / py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f
Patch
github.com / py-pdf/pypdf/pull/3666
Issue TrackingPatch
github.com / py-pdf/pypdf/releases/tag/6.7.5
ProductRelease Notes
github.com / py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852
PatchVendor Advisory