# CVE-2025-15536: 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. - Web page: https://patchblox.com/security/cve/CVE-2025-15536 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0025 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 18, 2026 ## Description 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 | Platform | 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](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libopencc-data-1.1.3-ds1-3ubuntu3.1.md) | Jan 18, 2026 | | Linux | libopencc-data Ubuntu 24.04.5 LTS (noble) | 1.1.7+ds1-1ubuntu0.1 | [libopencc-data 1.1.7+ds1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libopencc-data-1.1.7-ds1-1ubuntu0.1.md) | Jan 18, 2026 | | Linux | libopencc-data Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | [libopencc-data 1.1.9+ds1-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libopencc-data-1.1.9-ds1-2ubuntu0.1.md) | Jan 18, 2026 | | Linux | libopencc1.1 Ubuntu 22.04.1 LTS (jammy) | 1.1.3+ds1-3ubuntu3.1 | [libopencc1.1 1.1.3+ds1-3ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libopencc1.1-1.1.3-ds1-3ubuntu3.1.md) | Jan 18, 2026 | | Linux | libopencc1.1 Ubuntu 24.04.5 LTS (noble) | 1.1.7+ds1-1ubuntu0.1 | [libopencc1.1 1.1.7+ds1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libopencc1.1-1.1.7-ds1-1ubuntu0.1.md) | Jan 18, 2026 | | Linux | libopencc1.1 Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | [libopencc1.1 1.1.9+ds1-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libopencc1.1-1.1.9-ds1-2ubuntu0.1.md) | Jan 18, 2026 | | Linux | libopencc2 Ubuntu 18.04.6 LTS (bionic) | 1.0.4-5ubuntu0.1~esm1 | [libopencc2 1.0.4-5ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libopencc2-1.0.4-5ubuntu0.1-esm1.md) | Jan 18, 2026 | | Linux | libopencc2 Ubuntu 20.04 LTS (focal) | 1.0.5+git20190530-1ubuntu0.1~esm1 | [libopencc2 1.0.5+git20190530-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libopencc2-1.0.5-git20190530-1ubuntu0.1-esm1.md) | Jan 18, 2026 | | Linux | libopencc2-data Ubuntu 18.04.6 LTS (bionic) | 1.0.4-5ubuntu0.1~esm1 | [libopencc2-data 1.0.4-5ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libopencc2-data-1.0.4-5ubuntu0.1-esm1.md) | Jan 18, 2026 | | Linux | libopencc2-data Ubuntu 20.04 LTS (focal) | 1.0.5+git20190530-1ubuntu0.1~esm1 | [libopencc2-data 1.0.5+git20190530-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libopencc2-data-1.0.5-git20190530-1ubuntu0.1-esm1.md) | Jan 18, 2026 | | Linux | opencc Debian 13.5 (trixie) | 1.1.9+ds1-1+deb13u1 | [DEBIAN-CVE-2025-15536](https://patchblox.com/security/data/fix/linux/debian-cve-2025-15536.md) | Jan 18, 2026 | | Linux | opencc Debian 14 | 1.1.9+ds1-4 | [DEBIAN-CVE-2025-15536](https://patchblox.com/security/data/fix/linux/debian-cve-2025-15536.md) | Jan 18, 2026 | | Linux | opencc Fedora 43 | 1.1.9-5.fc43 | [FEDORA-2026-B627CD8944](https://patchblox.com/security/data/fix/linux/fedora-2026-b627cd8944.md) | Jan 23, 2026 | | Linux | opencc Ubuntu 18.04.6 LTS (bionic) | 1.0.4-5ubuntu0.1~esm1 | [opencc 1.0.4-5ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-opencc-1.0.4-5ubuntu0.1-esm1.md) | Jan 18, 2026 | | Linux | opencc Ubuntu 20.04 LTS (focal) | 1.0.5+git20190530-1ubuntu0.1~esm1 | [opencc 1.0.5+git20190530-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-opencc-1.0.5-git20190530-1ubuntu0.1-esm1.md) | Jan 18, 2026 | | Linux | opencc Ubuntu 22.04.1 LTS (jammy) | 1.1.3+ds1-3ubuntu3.1 | [opencc 1.1.3+ds1-3ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-opencc-1.1.3-ds1-3ubuntu3.1.md) | Jan 18, 2026 | | Linux | opencc Ubuntu 24.04.5 LTS (noble) | 1.1.7+ds1-1ubuntu0.1 | [opencc 1.1.7+ds1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-opencc-1.1.7-ds1-1ubuntu0.1.md) | Jan 18, 2026 | | Linux | opencc Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | [opencc 1.1.9+ds1-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-opencc-1.1.9-ds1-2ubuntu0.1.md) | Jan 18, 2026 | | Linux | opencc-debuginfo Fedora 43 | 1.1.9-5.fc43 | [FEDORA-2026-B627CD8944](https://patchblox.com/security/data/fix/linux/fedora-2026-b627cd8944.md) | Jan 23, 2026 | | Linux | opencc-debugsource Fedora 43 | 1.1.9-5.fc43 | [FEDORA-2026-B627CD8944](https://patchblox.com/security/data/fix/linux/fedora-2026-b627cd8944.md) | Jan 23, 2026 | | Linux | opencc-devel Fedora 43 | 1.1.9-5.fc43 | [FEDORA-2026-B627CD8944](https://patchblox.com/security/data/fix/linux/fedora-2026-b627cd8944.md) | Jan 23, 2026 | | Linux | opencc-doc Fedora 43 | 1.1.9-5.fc43 | [FEDORA-2026-B627CD8944](https://patchblox.com/security/data/fix/linux/fedora-2026-b627cd8944.md) | Jan 23, 2026 | | Linux | opencc-tools Fedora 43 | 1.1.9-5.fc43 | [FEDORA-2026-B627CD8944](https://patchblox.com/security/data/fix/linux/fedora-2026-b627cd8944.md) | Jan 23, 2026 | | Linux | opencc-tools-debuginfo Fedora 43 | 1.1.9-5.fc43 | [FEDORA-2026-B627CD8944](https://patchblox.com/security/data/fix/linux/fedora-2026-b627cd8944.md) | Jan 23, 2026 | | Linux | python3-opencc Ubuntu 25.10 (questing) | 1.1.9+ds1-2ubuntu0.1 | [python3-opencc 1.1.9+ds1-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-opencc-1.1.9-ds1-2ubuntu0.1.md) | Jan 18, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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