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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, 05:40 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

Red Hat has released updated Python 3.12 RPM packages as part of the Hardened Images update to address this vulnerability. Applying these updates will remediate the issue. Since the flaw requires connections to untrusted servers, limiting client HTTP connections to trusted sources and enforcing TLS validation can reduce risk. No additional mitigation is required if the update is applied.

Description

A vulnerability in Python's HTTP response and chunk parsing logic allows a remote server to send specially crafted HTTP responses containing non-hexadecimal or negative integers. This causes client applications to misinterpret response content, potentially leading to data integrity issues. The flaw is rated as moderate severity since it does not allow code execution or privilege escalation. Exploitation requires the client application to connect to an untrusted or malicious web server. Standard protections like TLS validation reduce the risk of exploitation from rogue intermediaries. Red Hat has issued an update for Hardened Images RPMs including Python 3.12 packages to address this issue.

References

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