CVE-2026-28351

MEDIUM EPSS 33.9%
Published Feb 27, 20264mo ago · Modified Mar 3, 20264mo ago
6.9 CVSS 4.0
Medium
Find Similar
Published Feb 27, 2026 4mo ago
Last Modified Mar 3, 2026 4mo ago

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
33.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

Affected Products 1

VendorProductVersionRange
pypdf_projectpypdf* <6.7.4

References 4

  • github.com https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858
    Patch
  • github.com https://github.com/py-pdf/pypdf/pull/3664
    Issue TrackingPatch
  • github.com https://github.com/py-pdf/pypdf/releases/tag/6.7.4
    Release Notes
  • github.com https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg
    PatchVendor Advisory

Remediation

  • github.com https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858
    Patch
  • github.com https://github.com/py-pdf/pypdf/pull/3664
    Issue TrackingPatch
  • github.com https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cg
    PatchVendor Advisory