Answer in brief
CVE-2026-120455 records a Medium severity (CVSS 6.9) vulnerability in rapidyaml through 0.16.0 Out-of-Bounds Write via ParseEngine::_add_annotation(). The current sources do not mark it as known exploited. The current feed maps biojppm/rapidyaml (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps biojppm/rapidyaml (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| biojppm/rapidyamlgeneric | >=0 <=0.16.0 | Not reported |
Published upstream
Nov 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 2, 2026
rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.
Quoted source text, attributed separately from HOL analysis.