CVE-2026-3644
EPSS 0.06%Incomplete control character validation in http.cookies
Published: 3/16/2026Modified: 5/16/2026
Description
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().
Affected packages (6)
- Bitnami/pythonfrom 0, < 3.15.0
- Bitnami/python-minfrom 0, < 3.15.0
- Debian/python3.11from 0
- Debian/python3.13from 0, < 3.13.5-2+deb13u2
- Debian/python3.14from 0, < 3.14.3-4
- Debian/python3.9from 0, < 3.9.2-1+deb11u7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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/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 |
References (8)
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-3644
- WEBhttps://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4
- WEBhttps://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd
- WEBhttps://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd
- WEBhttps://github.com/python/cpython/issues/145599
- WEBhttps://github.com/python/cpython/pull/145600
- WEBhttps://mail.python.org/archives/list/[email protected]/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2026-3644