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CVE-2026-4519VulnerabilityPublished 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-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

Currently, Red Hat does not provide an official fix or mitigation that meets their criteria for ease of use, applicability, or stability. No immediate mitigation is recommended by Red Hat.

Description

A vulnerability in Python's webbrowser.open() API allows crafted URLs with leading dashes to be interpreted as command-line options by certain browsers, potentially causing unexpected behavior, information disclosure, or arbitrary code execution. This affects Red Hat Hardened Images RPMs including python3.12 packages.

References

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