CVE-2025-4516
Use-after-free in "unicode_escape" decoder with error handler
02 Description
Use-after-free in "unicode_escape" decoder with error handler
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.22% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 13.0% of scored records. A rank, not a probability.
- NVD base score
- 5.9 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVD analysis status
- Deferred. NVD last modified this record on 2026-07-31.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2025-05-15 13:29Z1 YR AGO
- Last updated
- 2026-07-31 14:02Z2 MO AGO
- Reserved
- 2025-05-09
- Assigning CNA
- PSF
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.9)
- CNA CVSS vector
- 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
- Weaknesses
- CWE-416Use After FreeVariant
- Data version
- 5.2
- Document digest
- 9cb11aed17c404cd625f5685fa6ecaeb5b28c1c42e8cad846327f737a98e7720
05 Affected products
06 References
- github.comhttps://github.com/python/cpython/issues/133767
- github.comhttps://github.com/python/cpython/pull/129648
- mail.python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/
- github.comhttps://github.com/python/cpython/commit/69b4387f78f413e8c47572a85b3478c47eba8142
- github.comhttps://github.com/python/cpython/commit/9f69a58623bd01349a18ba0c7a9cb1dad6a51e8e
- github.comhttps://github.com/python/cpython/commit/4398b788ffc1f954a2c552da285477d42a571292
- github.comhttps://github.com/python/cpython/commit/6279eb8c076d89d3739a6edb393e43c7929b429d
- github.comhttps://github.com/python/cpython/commit/73b3040f592436385007918887b7e2132aa8431f
- github.comhttps://github.com/python/cpython/commit/8d35fd1b34935221aff23a1ab69a429dd156be77
- github.comhttps://github.com/python/cpython/commit/ab9893c40609935e0d40a6d2a7307ea51aec598b
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/05/16/4
- www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/05/19/1
07 Fixed in
AlmaLinux 8
- python39 Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-Cython Fixed
A version is affected if any line below covers it.
- Affected before 0.29.21-5.module_el8.6.0+2780+a40f65e1
- Affected before 0.29.21-5.module_el8.6.0+3248+c431e88c
- python39-PyMySQL Fixed in 0.10.1-2.module_el8.6.0+2780+a40f65e1
- python39-attrs Fixed in 20.3.0-2.module_el8.6.0+2780+a40f65e1
- python39-cffi Fixed
A version is affected if any line below covers it.
- Affected before 1.14.3-2.module_el8.6.0+2780+a40f65e1
- Affected before 1.14.3-2.module_el8.6.0+3248+c431e88c
- python39-chardet Fixed in 3.0.4-19.module_el8.6.0+2780+a40f65e1
- python39-cryptography Fixed in 3.3.1-3.module_el8.10.0+3765+2f9a457d
- python39-debug Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-devel Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-idle Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-idna Fixed in 2.10-4.module_el8.10.0+3849+a48d89aa
- python39-iniconfig Fixed in 1.1.1-2.module_el8.6.0+2780+a40f65e1
- python39-libs Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-lxml Fixed
A version is affected if any line below covers it.
- Affected before 4.6.5-1.module_el8.6.0+2780+a40f65e1
- Affected before 4.6.5-1.module_el8.6.0+3248+c431e88c
- python39-mod_wsgi Fixed in 4.7.1-7.module_el8.10.0+3989+a618fe15.1
- python39-more-itertools Fixed in 8.5.0-2.module_el8.6.0+2780+a40f65e1
- python39-numpy Fixed
A version is affected if any line below covers it.
- Affected before 1.19.4-3.module_el8.6.0+2780+a40f65e1
- Affected before 1.19.4-3.module_el8.6.0+3248+c431e88c
- python39-numpy-doc Fixed in 1.19.4-3.module_el8.6.0+2780+a40f65e1
- python39-numpy-f2py Fixed
A version is affected if any line below covers it.
- Affected before 1.19.4-3.module_el8.6.0+2780+a40f65e1
- Affected before 1.19.4-3.module_el8.6.0+3248+c431e88c
- python39-packaging Fixed in 20.4-4.module_el8.6.0+2780+a40f65e1
- python39-pip Fixed in 20.2.4-9.module_el8.10.0+3765+2f9a457d
- python39-pip-wheel Fixed in 20.2.4-9.module_el8.10.0+3765+2f9a457d
- python39-pluggy Fixed in 0.13.1-3.module_el8.6.0+2780+a40f65e1
- python39-ply Fixed in 3.11-10.module_el8.6.0+2780+a40f65e1
- python39-psutil Fixed
A version is affected if any line below covers it.
- Affected before 5.8.0-4.module_el8.6.0+2780+a40f65e1
- Affected before 5.8.0-4.module_el8.6.0+3248+c431e88c
- python39-psycopg2 Fixed in 2.8.6-3.module_el8.10.0+3765+2f9a457d
- python39-psycopg2-doc Fixed in 2.8.6-3.module_el8.10.0+3765+2f9a457d
- python39-psycopg2-tests Fixed in 2.8.6-3.module_el8.10.0+3765+2f9a457d
- python39-py Fixed in 1.10.0-1.module_el8.6.0+2780+a40f65e1
- python39-pybind11 Fixed
A version is affected if any line below covers it.
- Affected before 2.7.1-1.module_el8.6.0+2780+a40f65e1
- Affected before 2.7.1-1.module_el8.6.0+3248+c431e88c
- python39-pybind11-devel Fixed
A version is affected if any line below covers it.
- Affected before 2.7.1-1.module_el8.6.0+2780+a40f65e1
- Affected before 2.7.1-1.module_el8.6.0+3248+c431e88c
- python39-pycparser Fixed in 2.20-3.module_el8.6.0+2780+a40f65e1
- python39-pyparsing Fixed in 2.4.7-5.module_el8.6.0+2780+a40f65e1
- python39-pysocks Fixed in 1.7.1-4.module_el8.6.0+2780+a40f65e1
- python39-pytest Fixed in 6.0.2-2.module_el8.6.0+2780+a40f65e1
- python39-pyyaml Fixed
A version is affected if any line below covers it.
- Affected before 5.4.1-1.module_el8.6.0+2780+a40f65e1
- Affected before 5.4.1-1.module_el8.6.0+3248+c431e88c
- python39-requests Fixed in 2.25.0-3.module_el8.9.0+3634+fb2a896c
- python39-rpm-macros Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-scipy Fixed in 1.5.4-5.module_el8.9.0+3634+fb2a896c
- python39-setuptools Fixed in 50.3.2-7.module_el8.10.0+4040+9207bbc0
9 further packages in AlmaLinux 8 not shown (first 40 listed).
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- python39 Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-Cython Fixed
A version is affected if any line below covers it.
- Affected before 0.29.21-5.module_el8.6.0+2780+a40f65e1
- Affected before 0.29.21-5.module_el8.6.0+3248+c431e88c
- python39-PyMySQL Fixed in 0.10.1-2.module_el8.6.0+2780+a40f65e1
- python39-attrs Fixed in 20.3.0-2.module_el8.6.0+2780+a40f65e1
- python39-cffi Fixed
A version is affected if any line below covers it.
- Affected before 1.14.3-2.module_el8.6.0+2780+a40f65e1
- Affected before 1.14.3-2.module_el8.6.0+3248+c431e88c
- python39-chardet Fixed in 3.0.4-19.module_el8.6.0+2780+a40f65e1
- python39-cryptography Fixed in 3.3.1-3.module_el8.10.0+3765+2f9a457d
- python39-debug Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-devel Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-idle Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-idna Fixed in 2.10-4.module_el8.10.0+3849+a48d89aa
- python39-iniconfig Fixed in 1.1.1-2.module_el8.6.0+2780+a40f65e1
- python39-libs Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-lxml Fixed
A version is affected if any line below covers it.
- Affected before 4.6.5-1.module_el8.6.0+2780+a40f65e1
- Affected before 4.6.5-1.module_el8.6.0+3248+c431e88c
- python39-mod_wsgi Fixed in 4.7.1-7.module_el8.10.0+3989+a618fe15.1
- python39-more-itertools Fixed in 8.5.0-2.module_el8.6.0+2780+a40f65e1
- python39-numpy Fixed
A version is affected if any line below covers it.
- Affected before 1.19.4-3.module_el8.6.0+2780+a40f65e1
- Affected before 1.19.4-3.module_el8.6.0+3248+c431e88c
- python39-numpy-doc Fixed in 1.19.4-3.module_el8.6.0+2780+a40f65e1
- python39-numpy-f2py Fixed
A version is affected if any line below covers it.
- Affected before 1.19.4-3.module_el8.6.0+2780+a40f65e1
- Affected before 1.19.4-3.module_el8.6.0+3248+c431e88c
- python39-packaging Fixed in 20.4-4.module_el8.6.0+2780+a40f65e1
- python39-pip Fixed in 20.2.4-9.module_el8.10.0+3765+2f9a457d
- python39-pip-wheel Fixed in 20.2.4-9.module_el8.10.0+3765+2f9a457d
- python39-pluggy Fixed in 0.13.1-3.module_el8.6.0+2780+a40f65e1
- python39-ply Fixed in 3.11-10.module_el8.6.0+2780+a40f65e1
- python39-psutil Fixed
A version is affected if any line below covers it.
- Affected before 5.8.0-4.module_el8.6.0+2780+a40f65e1
- Affected before 5.8.0-4.module_el8.6.0+3248+c431e88c
- python39-psycopg2 Fixed in 2.8.6-3.module_el8.10.0+3765+2f9a457d
- python39-psycopg2-doc Fixed in 2.8.6-3.module_el8.10.0+3765+2f9a457d
- python39-psycopg2-tests Fixed in 2.8.6-3.module_el8.10.0+3765+2f9a457d
- python39-py Fixed in 1.10.0-1.module_el8.6.0+2780+a40f65e1
- python39-pybind11 Fixed
A version is affected if any line below covers it.
- Affected before 2.7.1-1.module_el8.6.0+2780+a40f65e1
- Affected before 2.7.1-1.module_el8.6.0+3248+c431e88c
- python39-pybind11-devel Fixed
A version is affected if any line below covers it.
- Affected before 2.7.1-1.module_el8.6.0+2780+a40f65e1
- Affected before 2.7.1-1.module_el8.6.0+3248+c431e88c
- python39-pycparser Fixed in 2.20-3.module_el8.6.0+2780+a40f65e1
- python39-pyparsing Fixed in 2.4.7-5.module_el8.6.0+2780+a40f65e1
- python39-pysocks Fixed in 1.7.1-4.module_el8.6.0+2780+a40f65e1
- python39-pytest Fixed in 6.0.2-2.module_el8.6.0+2780+a40f65e1
- python39-pyyaml Fixed
A version is affected if any line below covers it.
- Affected before 5.4.1-1.module_el8.6.0+2780+a40f65e1
- Affected before 5.4.1-1.module_el8.6.0+3248+c431e88c
- python39-requests Fixed in 2.25.0-3.module_el8.9.0+3634+fb2a896c
- python39-rpm-macros Fixed in 3.9.25-2.module_el8.10.0+4083+53cad1fb
- python39-scipy Fixed in 1.5.4-5.module_el8.9.0+3634+fb2a896c
- python39-setuptools Fixed in 50.3.2-7.module_el8.10.0+4040+9207bbc0
9 further packages in CloudLinux 8 not shown (first 40 listed).
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- python3.11 Fixed in 3.11.2-6+deb12u7
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- python3.13 Fixed in 3.13.3-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- python3.13 Fixed in 3.13.3-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- python3.10 Fixed in 3.10.12-1~22.04.10
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- python3.12 Fixed in 3.12.3-1ubuntu0.6
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- python3.14 Fixed in 3.14.0-1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- python3.14 Fixed in 3.14.0-1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 18.04 LTS
- python3.6 Fixed in 3.6.9-1~18.04ubuntu1.13+esm5Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- python3.7 Fixed in 3.7.5-2ubuntu1~18.04.2+esm6Available with Ubuntu Pro: https://ubuntu.com/pro
- python3.8 Fixed in 3.8.0-3ubuntu1~18.04.2+esm5Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 20.04 LTS
- python3.8 Fixed in 3.8.10-0ubuntu1~20.04.18+esm1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- python3.9 Fixed in 3.9.5-3ubuntu0~20.04.1+esm5Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 22.04 LTS
- python3.11 Fixed in 3.11.0~rc1-1~22.04.1~esm4Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.