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CVE-2026-4786VulnerabilityPublished Updated

Red Hat Security Advisory: python3 security update

Affects Red Hat python3Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-4786· 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 29 Oct 2026, 19:04 UTC

CVSS 4.0 base score
7.0High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.15.0b1, 3.14.5rc1, 3.13.14 +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 13 Apr 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 <3.15.0b1
Fixed in
  • 3.15.0b1
Python Software FoundationCPythonAffected
  • >=3.14.0a1 <3.14.5rc1
Fixed in
  • 3.14.5rc1
Python Software FoundationCPythonAffected
  • >=3.13.0 <3.13.14
Fixed in
  • 3.13.14
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 for Red Hat Enterprise Linux 8.6 that address these vulnerabilities. Users should apply the security update as described in Red Hat advisory RHSA-2026:17619 and the referenced article https://access.redhat.com/articles/11258. There is no indication that these issues are already mitigated or require no action. Patch status is confirmed by the vendor advisory. No known exploits in the wild have been reported at this time.

Description

This Red Hat security advisory addresses two vulnerabilities in the Python 3 packages for Red Hat Enterprise Linux 8.6. The first vulnerability (CVE-2026-6100) involves arbitrary code execution or information disclosure due to a use-after-free issue in decompression modules. The second vulnerability (CVE-2026-4786) allows arbitrary code execution via command injection in the webbrowser.open() API. These issues are rated as having an important security impact by Red Hat. Updates are available to remediate these vulnerabilities.

References

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