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CVE record · CVE-2025-4516

Use-after-free in "unicode_escape" decoder with error handler

CVSS 5.9 MediumEPSS 0.0022 · 13th percentile

Published by the CVE Program (CNA: PSF) at 15 May 2025, 13:29 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Python Software Foundation CPython
  • affected before 3.9.23 python
  • affected 3.10.0 to before 3.10.18 python
  • affected 3.11.0 to before 3.11.13 python
  • affected 3.12.0 to before 3.12.11 python
  • affected 3.13.0 to before 3.13.4 python
  • affected 3.14.0a1 to before 3.14.0b2 python
Other versions: unaffected
Identifiers
CVE-2025-4516
CNA
PSF
Weakness (CWE)
CWE-416
Tags
Published
15 May 2025
Updated
31 Jul 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.9 Medium 4.0 CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (PSF)
  • CISA KEV Not listed.
  • EPSS 0.0022, the 13th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 15 May 2025. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.