CVE-2026-31826

low-risk
Published 2026-03-10

pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.

Do I need to act?

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0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Pypdf Project

References (3)

Issue Tracking https://github.com/py-pdf/pypdf/pull/3675
Product https://github.com/py-pdf/pypdf/releases/tag/6.8.0
Patch https://github.com/py-pdf/pypdf/security/advisories/GHSA-hqmh-ppp3-xvm7
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal