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CVE-2026-103995VulnerabilityPublished 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-2026-103995· 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, 05:29 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 13 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

A fixed update is available in the python3.11 packages version 3.11.18-1.1.hum1 for Red Hat Hardened Images RPMs. Users should apply this update to remediate the vulnerability. Since the flaw requires connections to untrusted servers, restricting client HTTP connections to trusted sources and enforcing TLS validation can also reduce risk. No additional mitigation is required beyond applying the official fix.

Description

A vulnerability in Python's HTTP response and chunk parsing logic causes incorrect processing of non-hexadecimal or negative integers. This flaw can lead to misinterpretation of HTTP response content, potentially causing data integrity issues. Exploitation requires a client application to connect to a malicious or untrusted web server. The vulnerability does not allow code execution or privilege escalation and is rated moderate severity by Red Hat. The issue affects Red Hat Hardened Images RPMs with Python 3.11 packages. A fixed update is available in python3.11 version 3.11.18-1.1.hum1.

References

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