CRLF Injection

Overview org.webjars.npm:h3 is a Minimal HTTP framework built for high performance and portability. Affected versions of this package are vulnerable to CRLF Injection via unsanitized carriage return characters in the data and comment fields of the EventStream class. An attacker can inject arbitra...

0xkit (=0.0.1), 0xpass (>=0.0.11 <=0.1.26) +7918 more potentially affected by unknown CVE via h3 (>=0.2.12 <=1.15.6)

h3 NPM version =0.2.12, =0.0.11, =0.0.0-canary-3a59770274bcb6f3bebd5d1b93a2c92d1fc4edbd, =0.0.2, =0.1.0, =1.1.0, =0.1.0, =0.1.0, =1.0.21, =2.0.0, =0.1.4, =0.1.0, =0.1.2 and more Source cves: unknown CVE Source advisory: OSV:GHSA-4HXC-9384-M385...

Use of Incorrectly-Resolved Name or Reference

Overview h3 is a Minimal HTTP framework built for high performance and portability. Affected versions of this package are vulnerable to Use of Incorrectly-Resolved Name or Reference via the mount method. An attacker can manipulate request context and set unintended privilege flags by crafting...

@abysslabs/cli (=0.0.2), @analogjs/vite-plugin-nitro (>=2.4.0-alpha.2 <=3.0.0-alpha.1) +28 more potentially affected by CVE-2026-33490 via h3 (>=2.0.1-rc.11 <=2.0.1-rc.16)

h3 NPM version =2.0.1-rc.11, =2.4.0-alpha.2, =3.23.1-20260131-121433-34f631e, =0.15.0, =1.154.7, =0.0.1, =1.154.7, =1.154.7, =2.0.0-beta.20 and more Source cves: CVE-2026-33490 Source advisory: SNYK:JS-H3-15745916...

Directory Traversal

Overview h3 is a Minimal HTTP framework built for high performance and portability. Affected versions of this package are vulnerable to Directory Traversal via the serveStatic utility. An attacker can access arbitrary files from backend storage by sending specially crafted requests containing...

0xkit (=0.0.1), 0xpass (>=0.0.11 <=0.1.26) +7844 more potentially affected by unknown CVE via h3 (>=1.0.1 <=1.15.6)

h3 NPM version =1.0.1, =0.0.11, =0.0.0-canary-3a59770274bcb6f3bebd5d1b93a2c92d1fc4edbd, =0.0.2, =0.1.0, =1.1.0, =0.1.0, =0.1.0, =1.0.21, =2.0.0, =0.1.4, =0.1.0, =1.0.10, =1.0.11 and more Source cves: unknown CVE Source advisory: SNYK:JS-H3-15745711...

Directory Traversal

Overview org.webjars.npm:h3 is a Minimal HTTP framework built for high performance and portability. Affected versions of this package are vulnerable to Directory Traversal via the serveStatic utility. An attacker can access arbitrary files from backend storage by sending specially crafted request...

CVE-2026-33129

A flaw was found in H3, a minimal HTTP framework. A remote attacker can exploit a Timing Side-Channel vulnerability in the requireBasicAuth function. This vulnerability arises from the use of an unsafe string comparison, allowing the attacker to deduce valid passwords character-by-character by...

CVE-2026-33131

A flaw was found in H3, a minimal HTTP framework. When event.url, event.url.hostname, or event.url.url is accessed, such as in a logging middleware, the url getter constructs a URL from untrusted data, including the user-controlled Host header. Because H3's router resolves the route handler befor...

CVE-2026-33128

A flaw was found in H3, a minimal HTTP framework. A remote attacker can exploit this flaw by injecting malicious Server-Sent Events SSE due to improper sanitization of newline characters in the formatEventStreamMessage and formatEventStreamComment functions. An attacker who controls any part of a...

CVE-2026-33131

H3 is a minimal HTTP framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl which extends FastURL which allows middleware bypass. When event.url, event.url.hostname, or event.url.url is accessed, such as in a logging middleware, the url...

CVE-2026-33131

H3 is a minimal HTTP framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl which extends FastURL which allows middleware bypass. When event.url, event.url.hostname, or event.url.url is accessed, such as in a logging middleware, the url...

CVE-2026-33131 h3 has a middleware bypass with one gadget

H3 is a minimal HTTP framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl which extends FastURL which allows middleware bypass. When event.url, event.url.hostname, or event.url.url is accessed, such as in a logging middleware, the url...

CVE-2026-33131 h3 has a middleware bypass with one gadget

H3 is a minimal HTTP framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl which extends FastURL which allows middleware bypass. When event.url, event.url.hostname, or event.url.url is accessed, such as in a logging middleware, the url...

CVE-2026-33131 h3 has a middleware bypass with one gadget

H3 is a minimal HTTP framework. Versions 2.0.0-0 through 2.0.1-rc.14 contain a Host header spoofing vulnerability in the NodeRequestUrl which extends FastURL which allows middleware bypass. When event.url, event.url.hostname, or event.url.url is accessed, such as in a logging middleware, the url...

CVE-2026-33131

CVE-2026-33131 affects H3, a minimal HTTP framework. Versions 2.0.0-0 through 2.0.1-rc.14 expose a Host header spoofing flaw in the NodeRequestUrl/FastURL path, enabling middleware bypass when an attacker manipulates event.url properties (e.g., via Host header) so route matching succeeds but auth...

CVE-2026-33129

H3 is a minimal HTTP framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison !==. This allows an attacker to deduce the valid password character-by-character by measuring the server...

CVE-2026-33129 h3 has an observable timing discrepancy in basic auth utils

H3 is a minimal HTTP framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison !==. This allows an attacker to deduce the valid password character-by-character by measuring the server...

CVE-2026-33129 h3 has an observable timing discrepancy in basic auth utils

H3 is a minimal HTTP framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison !==. This allows an attacker to deduce the valid password character-by-character by measuring the server...

CVE-2026-33128

H3 is a minimal HTTP framework. In versions prior to 1.15.6 and between 2.0.0 through 2.0.1-rc.14, createEventStream is vulnerable to Server-Sent Events SSE injection due to missing newline sanitization in formatEventStreamMessage and formatEventStreamComment. An attacker who controls any part of...