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CVE-2026-0865VulnerabilityPublished Updated

Red Hat Security Advisory: python3.12 security update

Affects Red Hat python3.12Source GCVE Database

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Authoritative record:CVE-2026-0865· 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 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.15.0a6, 3.14.3, 3.13.12 +3
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/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 29 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Python Software FoundationCPythonAffected
  • >=3.15.0a1 <3.15.0a6
Fixed in
  • 3.15.0a6
Python Software FoundationCPythonAffected
  • >=3.14.0 <3.14.3
Fixed in
  • 3.14.3
Python Software FoundationCPythonAffected
  • >=3.13.0 <3.13.12
Fixed in
  • 3.13.12
Python Software FoundationCPythonAffected
  • >=3.12.0 <3.12.13
Fixed in
  • 3.12.13
Python Software FoundationCPythonAffected
  • >=3.11.0 <3.11.15
Fixed in
  • 3.11.15
Python Software FoundationCPythonAffected
  • <3.10.20
Fixed in
  • 3.10.20

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 security updates for Python 3.9 packages in Red Hat Enterprise Linux 9 and related variants to address CVE-2026-0865. Users should apply the available updates as described in the Red Hat advisory (RHSA-2026:18693) and the referenced update article (https://access.redhat.com/articles/11258). Patch status is confirmed as available. No additional mitigation steps are specified by the vendor.

Description

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * cpython: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes linked from the References section.

References

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