Medium · CVSS 5.3CVE-2024-9979

Pyo3: risk of use-after-free in `borrowed` reads from python weak referencesCVE-2024-9979

Answer in brief

CVE-2024-9979 records a Medium severity (CVSS 5.3) vulnerability in Pyo3: risk of use-after-free in `borrowed` reads from python weak references. The current sources do not mark it as known exploited. The current feed maps pyo3 (generic), Red Hat/python-rpds-py (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2024Updated Nov 5, 2026Source checked Nov 5, 2026First seen by HOL Nov 5, 2026Material review Nov 5, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.3. 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.

Affected scope and exposure questions

The current feed maps pyo3 (generic), Red Hat/python-rpds-py (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
pyo3generic	>=0.22.0 <0.22.4	0.22.4
Red Hat/python-rpds-pygeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for pyo3, Red Hat/python-rpds-py.
Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Evidence timeline and material changes

Published upstream
Oct 15, 2024
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 5, 2026

Sources and claim methodology

Upstream source description

A flaw was found in PyO3. This vulnerability causes a use-after-free issue, potentially leading to memory corruption or crashes via unsound borrowing from weak Python references.

Quoted source text, attributed separately from HOL analysis.

Package

Affected range

Fixed version

pyo3generic

>=0.22.0 <0.22.4

0.22.4

Red Hat/python-rpds-pygeneric

Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for pyo3, Red Hat/python-rpds-py.

Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Sources and claim methodology

Upstream source description

A flaw was found in PyO3. This vulnerability causes a use-after-free issue, potentially leading to memory corruption or crashes via unsound borrowing from weak Python references.

Quoted source text, attributed separately from HOL analysis.