Memory corruption in TODDR YAML::Syck
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA YAML::Syck (TODDR) Fixed in 1.36
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-11683
- 2026-10-03 Alias added: GHSA-gr2g-vmxj-5cv8
References
More TODDR Yaml vulnerabilities
- TI-2026-03625 Heap-based buffer overflow in TODDR YAML::Syck CVSS 3.1CRITICAL 9.1
Sources
- CVE-2025-11683 · CVE Program
- CVE-2025-11683 · NVD
- FIRST EPSS
- GHSA-gr2g-vmxj-5cv8 · GitHub Advisory Database · CC BY 4.0
- CVE-2025-11683 · Red Hat security data · CC BY 4.0
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