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CVE-2025-15366VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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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 python3.13 RPM packages for Hardened Images that fix this vulnerability. Users should apply these updates as per Red Hat's advisory instructions. Additionally, ensure that no data passed to the imaplib module contains newline or carriage return characters to mitigate the risk. Since a fix is available, applying the update is the recommended remediation.

Description

A vulnerability in the Python standard library's imaplib module allows injection of additional IMAP commands via control characters in user input. This can enable attackers with the ability to send IMAP commands to manipulate mailbox state, such as deleting or moving emails, or reading metadata. The issue does not permit arbitrary code execution or OS command injection. Red Hat has released an update for Hardened Images RPMs including python3.13 packages to address this flaw.

References

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