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CVE-2026-4519VulnerabilityPublished Updated

Red Hat Security Advisory: python3 security update

Affects Red Hat python3Source 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 packages that address this vulnerability. Users of affected Red Hat Enterprise Linux 8.8 variants should apply the provided security updates as described in the Red Hat advisory (RHSA-2026:9289) to remediate the issue. No additional mitigation steps are indicated beyond applying the official update.

Description

A command-line option injection vulnerability exists in the Python webbrowser.open() function via crafted URLs. This issue is addressed in a security update for python3 provided by Red Hat for Red Hat Enterprise Linux 8.8 variants. The vulnerability is identified as CVE-2026-4519 and is rated with high severity by Red Hat Product Security.

References

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