What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-15 · updated 2026-06-17
• Weakness: CWE-416

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.

Affected products

• Red Hat Enterprise Linux 10: all versions

References

• https://access.redhat.com/security/cve/CVE-2024-9979
• https://bugzilla.redhat.com/show_bug.cgi?id=2318646
• https://crates.io/crates/pyo3
• https://github.com/PyO3/pyo3/pull/4590
• https://rustsec.org/advisories/RUSTSEC-2024-0378.html

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