🛡️ CVE-2026-71852 — pypdf

⚪ Unknown ✅ No Known Exploit CWE-834 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

pypdf: Possible long runtimes/large memory usage for large CID font width ranges

Impact

An attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires parsing the font width entries 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 [#3946](https://github.com/py-pdf/pypdf/pull/3946).

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-2026-71852 is classified as CWE-834: Excessive Iteration. A loop can be driven to run far longer than intended, tying up the process.

Affected software

CVE-2026-71852 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-834
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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