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CVE-2026-4786VulnerabilityPublished Updated

Red Hat Security Advisory: python3.12 security update

Affects Red Hat python3.12Source 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 30 Oct 2026, 06:59 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 python3.12 packages that address these vulnerabilities. Users should apply the security update as described in the Red Hat advisory RHSA-2026:16699 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated by Red Hat. Systems running the affected versions should be updated promptly to remediate these issues.

Description

Red Hat has issued a security advisory for python3.12 addressing two vulnerabilities: a use-after-free in decompression modules (CVE-2026-6100) and a command injection vulnerability in the webbrowser.open() API (CVE-2026-4786). These issues could lead to arbitrary code execution or information disclosure. The advisory affects Red Hat Enterprise Linux 10.0 Extended Update Support and related CodeReady Linux Builder variants. The update is rated as Important by Red Hat Product Security. No CVSS score is provided in the advisory. A security update is available to remediate these vulnerabilities.

References

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