---
cve: "CVE-2026-3644"
severity: "MEDIUM"
cvss: 6.0
epss: "48%"
vendor: "Python Software Foundation"
kev: false
exploited: false
published: "2026-03-16 18:16:09"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T06:10:45+02:00"
---

# CVE-2026-3644

> 6.0 MEDIUM · 🧪 PoC

## Beschreibung

The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 01104ce1beb3135c2e0c01ec835b994c1f55a1c0 (Commit)
- 23116f998f6789d8c2fbe5ed5b8146854c8c2a4f (Commit)

## Referenzen

- <https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/>
- <https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4>
- <https://github.com/python/cpython/issues/145599>
- <https://github.com/python/cpython/pull/145600>
- <https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd>
- <https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd>
- <https://github.com/python/cpython/commit/556aa098e738b127c714866f819b4abe2f7593d8>
- <https://github.com/python/cpython/commit/dae4b1a21f8df4570e30986affd61bbe4ade4cef>
- <https://github.com/python/cpython/commit/3974092b037f9a3b000fb15b48ea61ce3b25d330>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-3644) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_