Description
Uvicorn before 0.11.7 is vulnerable to HTTP response splitting. CRLF sequences are not escaped in the value of HTTP headers. Attackers can exploit this to add arbitrary headers to HTTP responses, or even return an arbitrary response body, whenever crafted input is used to construct HTTP headers.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | uvicorn | < unspecified | unspecified |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-uvicorn | 0.13.3-1 | — |
| Debian 13 | python-uvicorn | 0.13.3-1 | — |
| Debian 12 | python-uvicorn | 0.13.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | python-uvicorn | No fix yet | — |
| Ubuntu 26.04 LTS | python-uvicorn | No fix yet | — |
| Ubuntu 25.10 | python-uvicorn | No fix yet | — |
| Ubuntu 24.04 LTS | python-uvicorn | No fix yet | — |
| Ubuntu 22.04 LTS | python-uvicorn | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | python-uvicorn | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | uvicorn | < 0.11.7 | 0.11.7 | GHSA-f97h-2pfx-f59f |