CVE-2026-85077 Sanic - HTTP Response Splitting

Sanic < 24.12.1 and 25.12.0 contain an HTTP response splitting vulnerability caused by improper sanitization of header names and values in response serialization, letting attackers inject headers and split responses, exploit requires attacker-controlled data in headers or cookies.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.48% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
HTTP Response Splitting
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Published
17 September 2026
Updated
15 October 2026
Weakness
CWE-113

Vendor fix

Update to versions 24.12.1 or 25.12.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs