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GHSA-674p-xv2x-rf3g
No affected components available
Summary
Litestar does not escape url paths when logging exceptions. This makes logger vulnerable to CRLF injection if logging level is configured to debug or log_exceptions is set to "always", which allows attackers to inject newlines and forge log entries.
Details
Litestar directly formats unquoted path into exception logs without validation or escaping when using default exception logging handler.
https://github.com/litestar-org/litestar/blob/1e0dc7c4d67151c836208a3e360051e983b5083a/litestar/logging/config.py#L145-L150
Attackers can inject newlines in logs by embedding%0d%0a in url path.
log_exceptions="always" is not enabled by default. However, it is set in the examples of documentation (https://github.com/litestar-org/litestar/blob/1e0dc7c4d67151c836208a3e360051e983b5083a/docs/usage/logging.rst#logging). User will be impacted if they directly copy the logging config from docs.
PoC
curl "http://172.17.0.2:8000/%29%0D%0AINFO:%20%20%20%20%20127.0.0.1:8192%20-%20%22POST%20/login%20HTTP/1.1%22%20200%20OK%0D%0A%28"
logging:
2025-07-15 00:00:00 - litestar - ERROR - Uncaught exception (connection_type=http, path=/)
INFO: 127.0.0.1:8192 - "POST /login HTTP/1.1" 200 OK
...
If stacktracks for 404 are configured to be ignored (disable_stack_trace={404},), attacker may also exploit this by sending malformed requests to cause 400/500 exceptions and avoid 404 in endpoints with str path parameters.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the integrity of the data.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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