CVE-2026-56285

High

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.

SeverityHigh

CVSS8.6

Exploit probability—

ProductZedeus Nitter

PublishedJun 29, 2026

First seenJun 29, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)CWE-1188CWE-1188

How to fix

Update

zedeus nitter44b2f096f67da2cc257a0e262a94a7ae79e95d47 or later

Patches

github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47

Affected products

Product	Affected versions	Fixed in
zedeus nitter	v < 44b2f096f67da2cc257a0e262a94a7ae79e95d47	44b2f096f67da2cc257a0e262a94a7ae79e95d47

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