CVE-2026-76172High· 7.5▾ TwilightA flaw was found in fast-uri, a software component used for parsing Uniform Resource Identifiers (URIs) in Node.js applications. This vulnerability arises from an issue in how fast-uri processes the scheme part of a URI, specifically when …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
Last analysed / modified upstream
A flaw was found in fast-uri, a software component used for parsing Uniform Resource Identifiers (URIs) in Node.js applications. This vulnerability arises from an issue in how fast-uri processes the scheme part of a URI, specifically when it contains special characters that are percent-encoded. An attacker can exploit this by crafting a malicious URI, causing the parser to misinterpret the host, which can lead to serious security risks. These risks include unauthorized redirection to external websites, server-side request forgery (SSRF) where the application makes unintended requests to internal or external resources, and bypassing security policies.
fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects — rated Important by Red Hat. Released 2026-08-24, updated 2026-09-21.
Affected:
Fixed:
No fix planned:
Not affected:
Before you apply this update, make sure all previously released errata that are relevant to your system are applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:67542 Before you apply this update, make sure all previously released errata that are relevant to your system are applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:67543 For more about Ansible plugins for Red Hat Developer Hub, see References links https://access.redhat.com/errata/RHSA-2026:65118
Affected packages:
fast-uri >= 2.3.1, < 2.4.5fast-uri >= 3.0.0, < 3.1.6fast-uri >= 4.0.0, < 4.1.3Patched in:
fast-uri 2.4.5fast-uri 3.1.6fast-uri 4.1.3Connected by shared product, vendor, weakness, or advisory.
CVE-2026-75899High· 7.5fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)
CVE-2026-75975High· 7.5fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)
CVE-2026-75931High· 7.5fast-uri: fast-uri: Host confusion via skipped IDN canonicalization (CVE-2026-75931)
CVE-2026-67314High· 7.4axios versions >=1.15.2 and <1.18.0 contain prototype-pollution read-side gadgets in Basic auth subfield handling (lib/adapters/http.js and lib/helpers/resolveConfig.js)
CVE-2026-18446High· 7.5fast-uri: fast-uri: Host confusion vulnerability via backslash in URI authority (CVE-2026-18446)
CVE-2026-47219High· 7.5find-my-way: find-my-way: Denial of Service vulnerability in HTTP/2 server (CVE-2026-47219)