CVE-2024-9979

Pyo3: risk of use-after-free in `borrowed` reads from python weak references

publishedCWE-416

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.

Technical severity5.3 mediumCVSS 3.1 · CNA: redhat

Published2024-10-15Source updated 2026-11-05

Collected2026-11-052 attributed sources

Fixes and workarounds

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.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
`pyo3` https://github.com/PyO3/pyo3	≥ 0.22.0; < 0.22.4 (affected, semver) Other versions: unaffected	CNA: redhat
Red Hat Ansible Automation Platform 2 Red Hat `python3.11-nh3` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Ansible Automation Platform 2 Red Hat `python3.11-rpds-py` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 10 Red Hat `python-rpds-py` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `python3.11-cryptography` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `python3.12-cryptography` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `python3.11-cryptography` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `python3.12-cryptography` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: unaffected	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 5.3 medium	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`	CNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/security/cve/CVE-2024-9979CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2318646CNA: redhat · issue-tracking, x_refsource_REDHAT
https://crates.io/crates/pyo3CNA: redhat
https://github.com/PyO3/pyo3/pull/4590CNA: redhat
https://rustsec.org/advisories/RUSTSEC-2024-0378.htmlCNA: redhat

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