{"id":"CVE-2024-9979","title":"Pyo3: risk of use-after-free in `borrowed` reads from python weak references","summary":"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.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","cvssSource":"cna","cwe":["CWE-416"],"vendor":"Red Hat","product":"pyo3","affected":["pyo3 >= 0.22.0 < 0.22.4","python3.11-nh3","python3.11-rpds-py","python-rpds-py (all versions)","python3.11-cryptography","python3.12-cryptography","python3.11-cryptography","python3.12-cryptography"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-10-15T14:19:04.359472Z"},"published":"2024-10-15","updated":"2026-11-05","sourceUpdated":"2026-11-05T14:45:39.461Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-9979","references":[{"url":"https://access.redhat.com/security/cve/CVE-2024-9979"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2318646","label":"RHBZ#2318646"},{"url":"https://crates.io/crates/pyo3"},{"url":"https://github.com/PyO3/pyo3/pull/4590"},{"url":"https://rustsec.org/advisories/RUSTSEC-2024-0378.html"}],"tags":["cve.org"],"epss":0.00206,"epssPercentile":0.10644,"ingestedAt":"2026-11-05T21:36:00.886Z","slug":"CVE-2024-9979","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `pyo3 >= 0.22.0 < 0.22.4`\n- `python3.11-nh3`\n- `python3.11-rpds-py`\n- `python-rpds-py (all versions)`\n- `python3.11-cryptography`\n- `python3.12-cryptography`\n- `python3.11-cryptography`\n- `python3.12-cryptography`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation 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.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}