Answer in brief
CVE-2026-71870 records a Medium severity (CVSS 4.8) vulnerability in pypdf: Possible large memory usage for large /ToUnicode streams. The current sources do not mark it as known exploited. The current feed maps py-pdf/pypdf (generic), pypdf (pip), pypdf (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps py-pdf/pypdf (generic), pypdf (pip), pypdf (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| py-pdf/pypdfgeneric | < 6.15.0 | Not reported |
| pypdfpip | <6.15.0 | 6.15.0 |
| pypdfpypi | >=0 <6.15.0 | 6.15.0 |
Published upstream
Aug 7, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
pypdf is a free and open-source pure-python PDF library. Prior to 6.15.0, a crafted PDF can cause large memory consumption when pypdf/_cmap.py function parse_bfrange parses unusually large source-code or destination-string tokens in a font /ToUnicode CMap during text extraction. This issue is fixed in 6.15.0.
Quoted source text, attributed separately from HOL analysis.