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CVE-2025-15366VulnerabilityPublished Updated

Red Hat Security Advisory: python3 security update

Affects Red Hat python3Source 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 python3 packages for Red Hat Enterprise Linux 8.8 to address these vulnerabilities. Users should apply the provided security updates as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258). No additional mitigation steps are specified or required beyond applying the official patches.

Description

This Red Hat security advisory addresses multiple vulnerabilities in the python3 package, including IMAP and POP3 command injection and email header injection due to unquoted newlines. These vulnerabilities could allow an attacker to inject commands or manipulate email headers when processing user-controlled input. The advisory rates the security impact as Moderate and provides updated packages for Red Hat Enterprise Linux 8.8 variants.

References

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