CVE-2026-119205
pypdf is a free and open-source pure-python PDF library
- Risk score
- 58/100
- CVSS
- 7.1 v4.0
- Published
- 29 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop when cloning or duplicating a crafted cyclic DictionaryObject. Clone traversal checked generated destination references rather than the original source references, allowing some source cycles to evade the visited…
- Affected
- See advisory
- Fix
- Upgrade the product to 6.21.4 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.1 high
- Remotely exploitable without logging in
- On your watchlist: python
References
Original description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop when cloning or duplicating a crafted cyclic DictionaryObject. Clone traversal checked generated destination references rather than the original source references, allowing some source cycles to evade the visited-object check. This issue is fixed in version 6.21.4.
Last activity 29 Oct 2026. Patch Forecast updates every hour.