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CVE-2025-15366VulnerabilityPublished Updated

Red Hat Security Advisory: python security update

Affects Red Hat pythonSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2025-15366· Medium 5.9

Not known to be exploited · CVSS 5.9 Medium · fixed in Red Hat package updates : update Red Hat CPython when convenient.

Data as of 5 Nov 2026, 18:33 UTC

CVSS 4.0 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 3.15.0a6, 3.14.7, 3.13.15
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade CPython to 3.15.0a6, 3.14.7 or 3.13.15.

Affected software

ProductAffectedFixed in
Python Software FoundationCPythonAffected
  • >=3.15.0a1 <3.15.0a6
Fixed in
  • 3.15.0a6
Python Software FoundationCPythonAffected
  • >=3.14.0 <3.14.7
Fixed in
  • 3.14.7
Python Software FoundationCPythonAffected
  • <3.13.15
Fixed in
  • 3.13.15
GitHubCPythonpkg:github/CPythonOther threatsAffected
  • <3.13.15
  • >=3.14.0 <3.14.7
  • >=3.15.0a1 <3.15.0a6
Fixed in
  • 3.13.15
  • 3.14.7
  • 3.15.0a6

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated Python packages for Red Hat Enterprise Linux Server Extended Life Cycle Support Extension 6 that address these vulnerabilities. Users should apply these official updates as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) to remediate the issues. No additional mitigation steps are specified or required beyond applying the provided updates.

Description

Red Hat has issued a security advisory for Python addressing two vulnerabilities involving command injection in user-controlled IMAP and POP3 commands. These vulnerabilities, tracked as CVE-2025-15366 and CVE-2025-15367, affect the cpython implementation. The advisory rates the impact as moderate and provides updated packages for Red Hat Enterprise Linux Server Extended Life Cycle Support Extension 6. No CVSS score is provided in the advisory.

References

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