CVE-2025-15536
Publication date 18 January 2026
Last updated 6 June 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| opencc | 26.04 LTS resolute |
Not affected
|
| 25.10 questing |
Fixed 1.1.9+ds1-2ubuntu0.1
|
|
| 24.04 LTS noble |
Fixed 1.1.7+ds1-1ubuntu0.1
|
|
| 22.04 LTS jammy |
Fixed 1.1.3+ds1-3ubuntu3.1
|
|
| 20.04 LTS focal |
Fixed 1.0.5+git20190530-1ubuntu0.1~esm1
|
|
| 18.04 LTS bionic |
Fixed 1.0.4-5ubuntu0.1~esm1
|
|
| 16.04 LTS xenial | Ignored end of ESM support, was needs-triage |
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On xenial and below, the code has been extensively refactored and backports may introduce regressions.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.3 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | Low |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
References
Related Ubuntu Security Notices (USN)
- USN-7972-1
- OpenCC vulnerability
- 21 January 2026
- USN-7972-2
- OpenCC vulnerability
- 26 May 2026