CVE-2026-31826 — Allocation of Resources Without Limits or Throttling in Pypdf

CWE-770 — Allocation of Resources Without Limits or Throttling7 documents6 sources
Severity
6.8MEDIUMNVD
EPSS
0.0%
top 99.79%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Py-pdf PypdfPypdf Project PypdfDebian Pypdf+1 more
Timeline
PublishedMar 10
Latest updateMar 11

Description

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.

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Affected Packages6 packages

▶CVEListV5py-pdf/pypdf< 6.8.0
▶debiandebian/pypdf< pypdf 6.9.0-1 (forky)
▶debiandebian/pypdf2< pypdf 6.9.0-1 (forky)
▶NVDpypdf_project/pypdf< 6.8.0
▶PyPIpypdf_project/pypdf< 6.8.0

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

3
OSV
pypdf: manipulated stream length values can exhaust RAM↗2026-03-11
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GHSA
pypdf: manipulated stream length values can exhaust RAM↗2026-03-11
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OSV
CVE-2026-31826: pypdf is a free and open-source pure-python PDF library↗2026-03-10
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📋Vendor Advisories

2
Red Hat
pypdf: pypdf: Denial of Service due to excessive memory consumption via crafted PDF↗2026-03-10
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Debian
CVE-2026-31826: pypdf - pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an atta...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-31826 Impact, Exploitability, and Mitigation Steps | Wiz↗
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