CVE Explorer

CVE-2026-48770

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.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6e4a032f88ef7c5b1a352afc6446c817e5099ece27fb7c3763d25648ea334ab3

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"notepad-plus-plus","vendor":"notepad-plus-plus","versions":[{"status":"affected","version":"< 8.9.6.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:66f655f0eb2ce3d3e5d55965e5b6d645ad4afd71f131efde811c62c98bd032c4 · sha256:182f63b812c3e7ee… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:66f655f0eb2ce3d3e5d55965e5b6d645ad4afd71f131efde811c62c98bd032c4 · sha256:182f63b812c3e7ee… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:66f655f0eb2ce3d3e5d55965e5b6d645ad4afd71f131efde811c62c98bd032c4 · sha256:182f63b812c3e7ee… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d","tags":["x_refsource_MISC"],"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:66f655f0eb2ce3d3e5d55965e5b6d645ad4afd71f131efde811c62c98bd032c4 · sha256:182f63b812c3e7ee… · /containers/cna/references/1

{"tags":["exploit"],"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:66f655f0eb2ce3d3e5d55965e5b6d645ad4afd71f131efde811c62c98bd032c4 · sha256:182f63b812c3e7ee… · /containers/adp/0/references/0

{"name":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:66f655f0eb2ce3d3e5d55965e5b6d645ad4afd71f131efde811c62c98bd032c4 · sha256:182f63b812c3e7ee… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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