CVE-2026-49859

Name
CVE-2026-49859
Description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, when fetch() was called, Deno checked the destination hostname against --deny-net rules but did not re-check the IP addresses that hostname resolved to. An attacker-controlled script could use a specially crafted domain name that passes the hostname check yet resolves to a denied IP, bypassing the network restriction entirely. This vulnerability is fixed in 2.8.1.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security-advisories@github.com https://github.com/denoland/deno/security/advisories/GHSA-cpgj-f7g3-2pp2

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:* deno >= None < 2.8.1

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
deno edge-community 2.7.4-r2 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.7.4-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.7.4-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r8 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r7 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r6 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r5 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r4 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r3 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r2 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r1 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.3.1-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.0.6-r2 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno edge-community 2.0.6-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
deno 3.24-community 2.7.4-r2 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable