qDecoder before 12.1.0 does not ensure that the percent character is followed by two hex digits for URL decoding.
https://github.com/wolkykim/qdecoder/releases/tag/v12.1.0
https://github.com/wolkykim/qdecoder/pull/29/commits/ce7c8a7ac450a823a11b06508ef1eb7441241f81#diff-1c4e2f5adfa1ad30618e78ff459b2c0758ecf34278459ad0a8d58db4fec622ea
https://github.com/wolkykim/qdecoder/pull/29
Source: Mitre, NVD
Published: 2022-06-03
Updated: 2026-06-17
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.00103