VulnerabilityAnalyzed
CVE-2026-28351
Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage.
MEDIUM 6.9EPSS 0.42%
Does this matter?
Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own.
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 4.0
- 6.9 MEDIUMCVSS: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/M
- EPSS
- 0.42% probability · 36th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- pypdf project/pypdf
- Source
- security-advisories@github.com
References
- https://github.com/py-pdf/pypdf/commit/f309c6003746414dc7b5048c19e6d879ff2dc858Patch
- https://github.com/py-pdf/pypdf/pull/3664Issue Tracking, Patch
- https://github.com/py-pdf/pypdf/releases/tag/6.7.4Release Notes
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-f2v5-7jq9-h8cgPatch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.