All vulnerabilities
CVE-2026-103995

CPython: Lenient parsing of integers for response body and chunk framing

Python Software Foundation CPythonRuntimes & languages
Open in ThreatlineRecord JSON
CVSS
2.0Low
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in3.16.0Fixed versionCVE List
Published27 Oct 2026Updated 27 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

Response body and chunk parsing would handle non-hex or negative integers incorrectly which could result in misinterpreting HTTP response contents.

Text from CVE List

Affected versions 1

  • CPythonaffected: all versions before 3.16.0CVE List

References 2