CVE-2026-6019
BaseCookie.js_output() does not neutralize embedded characters
6.1
MEDIUM
CVSS 3.1
EPSS 0.06%
Description
http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
How to fix CVE-2026-6019
To remediate CVE-2026-6019, upgrade the affected package to a fixed version below.
- —upgrade to 3.14.5 or later
- —upgrade to 3.14.5 or later
- —upgrade to 3.14.5 or later
- —no fix listed
- —no fix listed
- —upgrade to 3.13.5-2+deb13u2 or later
- —upgrade to 3.14.5~rc1-1 or later
- —no fix listed
Is CVE-2026-6019 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (8)
- from 0, < 3.14.5
- from 0, < 3.14.5
- from 0, < 3.14.5
- from 0
- from 0
- from 0, < 3.13.5-2+deb13u2
- from 0, < 3.14.5~rc1-1
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/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 |
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |