Answer in brief
CVE-2026-48155 records a Medium severity (CVSS 5.5) vulnerability in pypdf: Possible large memory usage for large offsets for layout mode text. The current sources do not mark it as known exploited. The current feed maps 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 5.5. 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 pypdf (pip), pypdf (pypi). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| pypdfpip | <6.12.0 | 6.12.0 |
| pypdfpypi | >=0 <6.12.0 | 6.12.0 |
Published upstream
May 28, 2026
Evidence: source:nvd:source_dates:source-dates:recordSource modified
Oct 14, 2026
Evidence: source:nvd:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets. ### Patches This has been fixed in [pypdf==6.12.0](https://github.com/py-pdf/pypdf/releases/tag/6.12.0). ### Workarounds If developers are unable to immediately upgrade, they should consider applying the changes from PR [#3790](https://github.com/py-pdf/pypdf/pull/3790).
Quoted source text, attributed separately from HOL analysis.