CVE-2026-15308

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.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• 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

0.64% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 48.0% of scored records. A rank, not a probability.

NVD base score

8.7 (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: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

Analyzed. NVD last modified this record on 2026-08-20.

Red Hat severity

Important. 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.

Published

2026-07-09 17:10Z1 MO AGO

Last updated

2026-08-13 00:28Z22 DAYS AGO

Reserved

2026-07-09

Assigning CNA

PSF

Record state

PUBLISHED

Severity

High (CVSS 8.7)

CNA CVSS vector

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

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass
• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')Base

Data version

5.2

Document digest

4827abf93a22435df8eb46b7112a0b15d1c477ce482b0575e7a29a4f6a17b920

• mail.python.orghttps://mail.python.org/archives/list/security-announce@python.org/thread/F6453LWKSHKCTWFLCOURWPLETNUIW2Z5/vendor-advisory
• github.comhttps://github.com/python/cpython/pull/153031patch
• github.comhttps://github.com/python/cpython/issues/153030issue-tracking
• github.comhttps://github.com/python/cpython/commit/07efb08123ba9367a7107325adb9d5626dca1ca9patch
• github.comhttps://github.com/python/cpython/commit/7933f4bf7131aa4140750f9404f5de0aa2969cedpatch
• github.comhttps://github.com/python/cpython/commit/bcf98ddbc40ec9b3ee87da0124a5660b19b7e606patch
• github.comhttps://github.com/python/cpython/commit/e9f92ac0b298292e7ff998e52cb8ccacfb27a0bdpatch
• github.comhttps://github.com/python/cpython/commit/785df8f743800661961528970f8598edcd291c14patch
• github.comhttps://github.com/python/cpython/commit/1e7956f1a722df9aabc509c30f8fbdc3a2b4fdc7patch
• github.comhttps://github.com/python/cpython/commit/c2390b9376e35a701ed3acc597b8fc87546c9b00patch
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/07/09/4