CVE-2024-9979
Pyo3: risk of use-after-free in `borrowed` reads from python weak references
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Pyo3: risk of use-after-free in `borrowed` reads from python weak references
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.
- Record
CVE-2024-9979- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-416
- Updated
- 2026-11-05
EUVDEUVD-2024-2969
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.
- Record
EUVD-2024-2969- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-05
GitHub AdvisoriesGHSA-6jgw-rgmm-7cv6
PyO3 has a risk of use-after-free in `borrowed` reads from Python weak references
The family of functions to read "borrowed" values from Python weak references were fundamentally unsound, because the weak reference does itself not have ownership of the value. At any point the last strong reference could be cleared and the borrowed value would become dangling.
In PyO3 0.22.4 these functions have all been deprecated and patched to leak a strong reference as a mitigation. PyO3 0.23 will remove these functions entirely.
- Record
GHSA-6jgw-rgmm-7cv6- CVSS 4.0
- 4.8 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-416
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2024-9979- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-416
- Updated
- 2026-11-05
OSV
Pyo3: risk of use-after-free in `borrowed` reads from python weak references
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.
- Record
CVE-2024-9979- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-416
- Updated
- 2026-11-07
OSVDEBIAN-CVE-2024-9979
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.
- Record
DEBIAN-CVE-2024-9979- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-02
OSVGHSA-6jgw-rgmm-7cv6
PyO3 has a risk of use-after-free in `borrowed` reads from Python weak references
The family of functions to read "borrowed" values from Python weak references were fundamentally unsound, because the weak reference does itself not have ownership of the value. At any point the last strong reference could be cleared and the borrowed value would become dangling.
In PyO3 0.22.4 these functions have all been deprecated and patched to leak a strong reference as a mitigation. PyO3 0.23 will remove these functions entirely.
- Record
GHSA-6jgw-rgmm-7cv6- CVSS 4.0
- 4.8 Medium
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Weakness
- CWE-416
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2024-9979
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.
- Record
UBUNTU-CVE-2024-9979- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - Updated
- 2026-11-02
OSVRUSTSEC-2024-0378 No score
Risk of use-after-free in `borrowed` reads from Python weak references
The family of functions to read "borrowed" values from Python weak references were fundamentally unsound, because the weak reference does itself not have ownership of the value. At any point the last strong reference could be cleared and the borrowed value would become dangling.
In PyO3 0.22.4 these functions have all been deprecated and patched to leak a strong reference as a mitigation. PyO3 0.23 will remove these functions entirely.
- Record
RUSTSEC-2024-0378- Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | CVE List, EUVD | |
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-9979 is a medium vulnerability (CVSS 5.3) in Red Hat Ansible Automation Platform 2, published October 12, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 10th percentile. Fixed in pyo3 0.22.4.
References
access.redhat.com/security/cve/CVE-2024-9979
bugzilla.redhat.com/show_bug.cgi?id=2318646
crates.io/crates/pyo3
github.com/PyO3/pyo3/pull/4590
rustsec.org/advisories/RUSTSEC-2024-0378.html
nvd.nist.gov/vuln/detail/CVE-2024-9979
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security-tracker.debian.org/tracker/CVE-2024-9979
ubuntu.com/security/CVE-2024-9979
cve.org/CVERecord?id=CVE-2024-9979