Low severity · published Oct 27, 2026
CVE-2026-103995
Lenient parsing of integers for response body and chunk framing
New
2.0
CVSS
0.4%
EPSS
No
On KEV
Description
Response body and chunk parsing would handle non-hex or negative integers incorrectly which could result in misinterpreting HTTP response contents.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CP
CPython · Python Software Foundation
before 3.16.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-103995
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-103995
github.com
https://github.com/python/cpython/issues/150751
github.com
https://github.com/python/cpython/pull/150752
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