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CVE-2026-103995
Lenient parsing of integers for response body and chunk framing
Low2.0EPSS 0.36%
- Published
- Updated
- Reserved
- Assigned by
- PSF
Description
Response body and chunk parsing would handle non-hex or negative integers incorrectly which could result in misinterpreting HTTP response contents.
Timeline
ID reserved
By PSF
- 26 days later
· 26 days later
Published
- 8 days later
· 8 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| PSFCNA (assigner) | 4.0 | Low2.0 | 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 |
| NVDNVD · Awaiting Analysis | 4.0 | Low2.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.36% · top 70% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.0.
Weakness
Affected products
Python Software Foundation · CPython
- affected < 3.16.0
References (4)
- https://github.com/python/cpython/pull/150752 (opens in a new tab)patch
- https://github.com/python/cpython/issues/150751 (opens in a new tab)issue-tracking
- https://github.com/python/cpython/commit/2eb2af805c156ca52b316bb4ced5e0ab3971d0ae (opens in a new tab)patch
- https://github.com/python/cpython/commit/9f52b443c002cccfb54bda0706a9276b6b4a109d (opens in a new tab)patch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-103995)Record last updated .