🛡️ CVE-2026-59935 — pypdf

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-835 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)

Impact

An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires parsing the content stream of a page with a not terminated inline image, as done when extracting the page text for example. It only affects the ASCII85 and ASCIIHex filters.

Patches

This has been fixed in [pypdf==6.14.2](https://github.com/py-pdf/pypdf/releases/tag/6.14.2).

Workarounds

If you cannot upgrade yet, consider applying the changes from PR [#3892](https://github.com/py-pdf/pypdf/pull/3892).

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-59935 is classified as CWE-835: Infinite Loop. A loop condition can never become false for some inputs, hanging the process.

Affected software

CVE-2026-59935 is recorded against 1 package.

  • pypdf (fixed in 6.14.2)

Timeline and source

Published on 23 July 2026 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE CWE-835
Public Exploit ✅ No
Source OSV
Published 2026-07-23
Updated 2026-08-12
Modified 2026-08-04

Affected Packages

Software From version Fixed in
pypdf — 6.14.2

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