CVE-2026-0865
wsgiref.headers.Headers allows header newline injection
EPSS 0.17%
Description
User-controlled header names and values containing newlines can allow injecting HTTP headers.
How to fix CVE-2026-0865
To remediate CVE-2026-0865, upgrade the affected package to a fixed version below.
- Bitnami/libpython—upgrade to 3.10.20 or later
- Bitnami/python—upgrade to 3.10.20 or later
- Bitnami/python-min—upgrade to 3.10.20 or later
- Debian/jython—no fix listed
- —no fix listed
- —no fix listed
- —upgrade to 3.11.2-6+deb12u7 or later
- —upgrade to 3.13.5-2+deb13u1 or later
- —upgrade to 3.14.3-1 or later
- —upgrade to 3.9.2-1+deb11u5 or later
Is CVE-2026-0865 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (10)
- from 0, < 3.10.20, >= 3.11.0, < 3.11.15, >= 3.12.0, < 3.12.13, >= 3.13.0, < 3.13.12, >= 3.14.0, < 3.14.3
- from 0, < 3.10.20, >= 3.11.0, < 3.11.15, >= 3.12.0, < 3.12.13, >= 3.13.0, < 3.13.12, >= 3.14.0, < 3.14.3
- from 0, < 3.10.20, >= 3.11.0, < 3.11.15, >= 3.12.0, < 3.12.13, >= 3.13.0, < 3.13.12, >= 3.14.0, < 3.14.3
- from 0
- from 0
- from 0
- from 0, < 3.11.2-6+deb12u7
- from 0, < 3.13.5-2+deb13u1
- from 0, < 3.14.3-1
- from 0, < 3.9.2-1+deb11u5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/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 |