CVE-2026-103995

Lenient parsing of integers for response body and chunk framing

CVE-2026-103995 has no fix on record yet for 12 affected products. It is not reported as exploited. Patch Radar priority: Routine.

RoutineFixed on 2 platforms

CVSS

2.0

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0036

29th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
No fix yet
Python 2 (Windows apps)	No fix yet	no-fix	n/a
Python 3.10 (Windows apps)	No fix yet	no-fix	n/a
Python 3.11 (Windows apps)	No fix yet	no-fix	n/a
Python 3.12 (Windows apps)	No fix yet	no-fix	n/a
Python 3.13 (Windows apps)	No fix yet	no-fix	n/a
Python 3.14 (Windows apps)	No fix yet	no-fix	n/a
Python 3.5 (Windows apps)	No fix yet	no-fix	n/a
Python 3.6 (Windows apps)	No fix yet	no-fix	n/a
Python 3.7 (Windows apps)	No fix yet	no-fix	n/a
Python 3.8 (Windows apps)	No fix yet	no-fix	n/a
Python 3.9 (Windows apps)	No fix yet	no-fix	n/a
Python3 (macOS)	No fix yet	no-fix	n/a

Details

Published
October 27, 2026
Weakness
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-103995

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