mediumVulnerability
CVE-2026-82398
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.
Properties
- severity
- medium
- summary
- pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace
- epss_score
- 0.00524
- retrieved_at
- 2026-10-16T22:35:09+00:00
- ghsa_published
- 2026-09-02T14:38:12Z
- source_url
- https://github.com/advisories/GHSA-fc8x-2rww-xw9m
- ghsa_updated
- 2026-09-02T14:38:13Z
- ghsa_id
- GHSA-fc8x-2rww-xw9m
- last_source
- FIRST EPSS
- cve_id
- CVE-2026-82398
- signal_observed_at
- 2026-09-11T17:55:57+00:00
- is_ghsa_only
- false
- published_at
- 2026-08-31T22:17:23.083
- last_modified
- 2026-09-09T16:49:20.627
- epss_percentile
- 0.43142
Related Entities (6)
DESCRIBED_BY (1)
→[Source]NVD
ENRICHED_BY (1)
→[Source]FIRST EPSS
REPORTED_BY (1)
→[Source]GitHub Advisory Database
VULNERABLE_TO (1)
←[Software]pip/pypdf
AFFECTS (1)
→[Software]pip/pypdf
HAS_WEAKNESS (1)
→[Weakness]Inefficient Algorithmic Complexity
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