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CVE-2026-103995VulnerabilityPublished

Red Hat Security Advisory: python3 security update

Affects Red Hat python3Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-103995· Low 2.0

Not known to be exploited · CVSS 2.0 Low : upgrade Red Hat CPython to 3.16.0 when convenient.

Data as of 13 Nov 2026, 00:08 UTC

CVSS 4.0 base score
2.0Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (PSF)CVSS 4.02.0
Patch
Available – fixed in 3.16.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Oct 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 12 Nov 2026.

What to do

Upgrade CPython to 3.16.0.

Affected software

ProductAffectedFixed in
Python Software FoundationCPythonAffected
  • <3.16.0
Fixed in
  • 3.16.0
GitHubCPythonpkg:github/CPythonOther threatsAffected
  • <3.16.0
Fixed in
  • 3.16.0

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 that address these vulnerabilities. Users should apply the provided updates as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) to remediate these issues. No additional mitigation steps are indicated beyond applying the official patches.

Description

This Red Hat security advisory addresses multiple moderate severity vulnerabilities in the python3 package for Red Hat Enterprise Linux 8. The issues include an arbitrary file write via tarfile extraction filter bypass (CVE-2026-114583), misinterpretation of HTTP responses due to invalid chunk parsing (CVE-2026-103995), and a security bypass via null byte truncation in socket.getaddrinfo() (CVE-2026-116566). Updates are available to remediate these vulnerabilities.

References

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