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BREW-pdfalyzer-CVE-2026-82398 — pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace

2026-10-03T18:07:01.203538+00:00

Affected: Homebrew: pdfalyzer

### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a call to `read_until_whitespace` with an input which does not have whitespace for a long time.

### 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 [#3947](https://github.com/py-pdf/pypdf/pull/3947).

CVE-2026-82398 — pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace

2026-10-03T18:07:01.203600+00:00

Affected: py-pdf pypdf

pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, an attacker can craft a PDF that causes long runtimes when the pypdf/_utils.py function read_until_whitespace reads a stream containing a long run of bytes without whitespace. The function repeatedly performs immutable bytes concatenation in a one-byte loop, causing quadratic processing cost for the long non-whitespace input. This issue is fixed in version 6.15.0.

GHSA-fc8x-2rww-xw9m — pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace

2026-10-03T18:07:01.203631+00:00

Affected: PyPI: pypdf

### 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 [#3947](https://github.com/py-pdf/pypdf/pull/3947).