CVE-2025-11683
Publication date 16 October 2025
Last updated 29 October 2025
Ubuntu priority
Description
YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values. There is no indication that the issue leads to accessing memory outside that allocated to the module.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libyaml-syck-perl | 25.10 questing |
Fixed 1.34-3ubuntu0.1
|
| 25.04 plucky |
Fixed 1.34-2ubuntu0.25.04.1
|
|
| 24.04 LTS noble |
Fixed 1.34-2ubuntu0.24.04.1~esm1
|
|
| 22.04 LTS jammy |
Fixed 1.34-1ubuntu0.1~esm1
|
|
| 20.04 LTS focal |
Fixed 1.31-1ubuntu0.1~esm1
|
|
| 18.04 LTS bionic |
Fixed 1.29-1ubuntu0.18.04.1~esm1
|
|
| 16.04 LTS xenial |
Fixed 1.29-1ubuntu0.16.04.1~esm1
|
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Get Ubuntu Pro 30-day free trialSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.5 · Medium
|
| Attack vector | Adjacent |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-7844-1
- YAML::Syck vulnerability
- 28 October 2025