🛡️ CVE-2026-71870 — pypdf

⚪ Unknown ✅ No Known Exploit CWE-400 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

pypdf: Possible large memory usage for large /ToUnicode streams

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction.

Patches

This has been fixed in [pypdf==6.15.0](https://github.com/py-pdf/pypdf/releases/tag/6.15.0).

Workarounds

If you cannot upgrade yet, consider applying the changes from PR [#3944](https://github.com/py-pdf/pypdf/pull/3944).

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

CVE-2026-71870 is classified as CWE-400: Uncontrolled Resource Consumption. A request can consume memory, CPU or storage without limit, exhausting capacity for everyone else.

Affected software

CVE-2026-71870 is recorded against 2 packages.

  • pypdf (fixed in 6.15.0)
  • unknown

Timeline and source

Published on 7 August 2026 and last revised on 10 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CWE CWE-400
Public Exploit ✅ No
Source NVD
Published 2026-08-07
Updated 2026-08-12
Modified 2026-08-10
Fix URL N/A

Affected Packages

Software From version Fixed in
pypdf — 6.15.0
unknown — —

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