opencc: A weakness has been identified in BYVoid OpenCC up to 1.1.9
CVE-2025-15536 is fixed in 12 products on 1 platform, first by libopencc-data 1.1.3+ds1-3ubuntu3.1, released January 18, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A weakness has been identified in BYVoid OpenCC up to 1.1.9. This vulnerability affects the function opencc::MaxMatchSegmentation of the file src/MaxMatchSegmentation.cpp. This manipulation causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been made available to the public and could be used for attacks. Patch name: 345c9a50ab07018f1b4439776bad78a0d40778ec. To fix this issue, it is recommended to deploy a patch.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libopencc-data · Ubuntu 22.04.1 LTS (jammy) | 1.1.3+ds1-3ubuntu3.1 | libopencc-data 1.1.3+ds1-3ubuntu3.1 | Jan 18, 2026 |
| libopencc-data · Ubuntu 24.04.5 LTS (noble) | 1.1.7+ds1-1ubuntu0.1 | libopencc-data 1.1.7+ds1-1ubuntu0.1 | Jan 18, 2026 |
| libopencc-data · Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | libopencc-data 1.1.9+ds1-2ubuntu0.1 | Jan 18, 2026 |
| libopencc1.1 · Ubuntu 22.04.1 LTS (jammy) | 1.1.3+ds1-3ubuntu3.1 | libopencc1.1 1.1.3+ds1-3ubuntu3.1 | Jan 18, 2026 |
| libopencc1.1 · Ubuntu 24.04.5 LTS (noble) | 1.1.7+ds1-1ubuntu0.1 | libopencc1.1 1.1.7+ds1-1ubuntu0.1 | Jan 18, 2026 |
| libopencc1.1 · Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | libopencc1.1 1.1.9+ds1-2ubuntu0.1 | Jan 18, 2026 |
| libopencc2 · Ubuntu 18.04.6 LTS (bionic) | 1.0.4-5ubuntu0.1~esm1 | libopencc2 1.0.4-5ubuntu0.1~esm1 | Jan 18, 2026 |
| libopencc2 · Ubuntu 20.04 LTS (focal) | 1.0.5+git20190530-1ubuntu0.1~esm1 | libopencc2 1.0.5+git20190530-1ubuntu0.1~esm1 | Jan 18, 2026 |
| libopencc2-data · Ubuntu 18.04.6 LTS (bionic) | 1.0.4-5ubuntu0.1~esm1 | libopencc2-data 1.0.4-5ubuntu0.1~esm1 | Jan 18, 2026 |
| libopencc2-data · Ubuntu 20.04 LTS (focal) | 1.0.5+git20190530-1ubuntu0.1~esm1 | libopencc2-data 1.0.5+git20190530-1ubuntu0.1~esm1 | Jan 18, 2026 |
| opencc · Debian 13.5 (trixie) | 1.1.9+ds1-1+deb13u1 | DEBIAN-CVE-2025-15536 | Jan 18, 2026 |
| opencc · Debian 14 | 1.1.9+ds1-4 | DEBIAN-CVE-2025-15536 | Jan 18, 2026 |
| opencc · Fedora 43 | 1.1.9-5.fc43 | FEDORA-2026-B627CD8944 | Jan 23, 2026 |
| opencc · Ubuntu 18.04.6 LTS (bionic) | 1.0.4-5ubuntu0.1~esm1 | opencc 1.0.4-5ubuntu0.1~esm1 | Jan 18, 2026 |
| opencc · Ubuntu 20.04 LTS (focal) | 1.0.5+git20190530-1ubuntu0.1~esm1 | opencc 1.0.5+git20190530-1ubuntu0.1~esm1 | Jan 18, 2026 |
| opencc · Ubuntu 22.04.1 LTS (jammy) | 1.1.3+ds1-3ubuntu3.1 | opencc 1.1.3+ds1-3ubuntu3.1 | Jan 18, 2026 |
| opencc · Ubuntu 24.04.5 LTS (noble) | 1.1.7+ds1-1ubuntu0.1 | opencc 1.1.7+ds1-1ubuntu0.1 | Jan 18, 2026 |
| opencc · Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | opencc 1.1.9+ds1-2ubuntu0.1 | Jan 18, 2026 |
| opencc-debuginfo · Fedora 43 | 1.1.9-5.fc43 | FEDORA-2026-B627CD8944 | Jan 23, 2026 |
| opencc-debugsource · Fedora 43 | 1.1.9-5.fc43 | FEDORA-2026-B627CD8944 | Jan 23, 2026 |
| opencc-devel · Fedora 43 | 1.1.9-5.fc43 | FEDORA-2026-B627CD8944 | Jan 23, 2026 |
| opencc-doc · Fedora 43 | 1.1.9-5.fc43 | FEDORA-2026-B627CD8944 | Jan 23, 2026 |
| opencc-tools · Fedora 43 | 1.1.9-5.fc43 | FEDORA-2026-B627CD8944 | Jan 23, 2026 |
| opencc-tools-debuginfo · Fedora 43 | 1.1.9-5.fc43 | FEDORA-2026-B627CD8944 | Jan 23, 2026 |
| python3-opencc · Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | python3-opencc 1.1.9+ds1-2ubuntu0.1 | Jan 18, 2026 |
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