PoC Index

CVE-2026-48770

MEDIUM 5.0EPSS 0.1%

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.

CVSS v3.1
5.0 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS
0.14% chance of exploitation in the next 30 days, 4th percentile
Published
2026-06-26
Updated
2026-06-29

Proof-of-concept exploits (1)

References

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