CVE-2026-3298

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.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 32.3% of scored records. A rank, not a probability.

NVD base score

8.8 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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

Awaiting Analysis. NVD last modified this record on 2026-08-13.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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.

Published

2026-04-21 14:45Z4 MO AGO

Last updated

2026-08-13 00:27Z22 DAYS AGO

Reserved

2026-02-26

Assigning CNA

PSF

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Weaknesses

• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

14850235119432e1856f8b3a62aacc61e85ae4094dd5c177d8ecf9ae2edf6124

• github.comhttps://github.com/python/cpython/pull/148809patch
• github.comhttps://github.com/python/cpython/issues/148808issue-tracking
• mail.python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/KWTPIQBOOOUNQP7UFSLBI437NJDFLA3F/vendor-advisory
• github.comhttps://github.com/python/cpython/commit/1274766d3c29007ab77245a72abbf8dce2a9db4dpatch
• github.comhttps://github.com/python/cpython/commit/27522b7d6e6588f03e61099dd858cd5a9314e2f2patch
• github.comhttps://github.com/python/cpython/commit/95633d2aad4721e25e4dfd9f43dfb6e1edcbd741patch
• github.comhttps://github.com/python/cpython/commit/6c8b85b3f1d83d5697ec19880960e1eacee56688patch
• github.comhttps://github.com/python/cpython/commit/f5ca38739241fe7a40a4b116d5a8a1364dd6fea7patch