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CVE-2026-4519VulnerabilityPublished Updated

Red Hat Security Advisory: python3.11 security update

Affects Red Hat python3.11Source GCVE Database

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Authoritative record:CVE-2026-4519· High 7.0

Not known to be exploited · CVSS 7.0 High · fixed in Red Hat package updates : patch Red Hat cpython soon.

Data as of 6 Nov 2026, 01:02 UTC

CVSS 4.0 base score
7.0High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 3.15.0a8, 3.14.4, 3.13.13 +3
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Mar 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 to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Python Software FoundationCPythonAffected
  • >=3.15.0a1 <3.15.0a8
Fixed in
  • 3.15.0a8
Python Software FoundationCPythonAffected
  • >=3.14.0 <3.14.4
Fixed in
  • 3.14.4
Python Software FoundationCPythonAffected
  • >=3.13.0 <3.13.13
Fixed in
  • 3.13.13
Python Software FoundationCPythonAffected
  • >=3.12.0 <3.12.14
Fixed in
  • 3.12.14
Python Software FoundationCPythonAffected
  • >=3.11.0 <3.11.16
Fixed in
  • 3.11.16
Python Software FoundationCPythonAffected
  • <3.10.21
Fixed in
  • 3.10.21

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 python3.11 packages that fix this vulnerability. Users of Red Hat Enterprise Linux 9.4 Extended Update Support should apply the security update as described in the Red Hat advisory RHSA-2026:9042. Details on applying the update are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patch.

Description

A command-line option injection vulnerability exists in the Python webbrowser.open() function when handling crafted URLs. This flaw is identified as CVE-2026-4519 and affects Python 3.11 as packaged by Red Hat Enterprise Linux 9.4 Extended Update Support. The vulnerability allows injection of command-line options via malicious URLs, potentially leading to unintended command execution. Red Hat has issued a security update to address this issue.

References

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