Answer in brief
CVE-2026-4224 records a High severity (CVSS 7.5) vulnerability in Stack overflow parsing XML with deeply nested DTD content models. The current sources do not mark it as known exploited. The current feed maps Python Software Foundation/CPython (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-4224 records a High severity (CVSS 7.5) vulnerability in Stack overflow parsing XML with deeply nested DTD content models. The current sources do not mark it as known exploited. The current feed maps Python Software Foundation/CPython (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 7.5. 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 Python Software Foundation/CPython (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:python:python:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Python Software Foundation/CPythongeneric | >=0 <3.13.13 || >=3.14.0 <3.14.4 || >=3.15.0a1 <3.15.0a8 | 3.13.13, 3.14.4, 3.15.0a8 |
Published upstream
Mar 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.5. 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 Python Software Foundation/CPython (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:python:python:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Python Software Foundation/CPythongeneric | >=0 <3.13.13 || >=3.14.0 <3.14.4 || >=3.15.0a1 <3.15.0a8 | 3.13.13, 3.14.4, 3.15.0a8 |
Published upstream
Mar 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.
Quoted source text, attributed separately from HOL analysis.