Dashboard / CVE-2026-121441

CVE-2026-121441

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 63/100
Published: 2026-11-03 Modified: 2026-11-03 First seen: 2026-11-03 Status: active

Attack Surface

Network No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
AT: Present
VC: None
VI: Low
VA: None

Description

Wasmtime before 36.0.19, 37.0.0 before 48.0.7, and 49.0.0 before 49.0.4 contains a request smuggling vulnerability in wasi-http that allows guests to set multiple conflicting content-length headers. Malicious guests can make the host send HTTP requests with conflicting content-length values to smuggle requests through servers or intermediaries that do not reject them.

Weakness Classification (1)

Affected Software (6)

VendorProductVersion
bytecodealliance wasmtime 0 < 36.0.19
bytecodealliance wasmtime 37.0.0 < 48.0.7
bytecodealliance wasmtime 49.0.0 < 49.0.4
bytecodealliance wasmtime 0 < 36.0.19
bytecodealliance wasmtime 37.0.0 < 48.0.7
bytecodealliance wasmtime 49.0.0 < 49.0.4

References & Advisories (2)

Bug Bounty Relevance

63 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction

CVSS Score

6.3 / 10.0 v4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS — Exploitation Probability

0.22%
Raw Score 0.002240
Percentile 13.2%
Date 2026-11-14

EPSS Trend

2026-11-14
0.00224
2026-11-13
0.00224
2026-11-12
0.00224
2026-11-10
0.00224
2026-11-09
0.00224
2026-11-08
0.00224
2026-11-07
0.00224
2026-11-06
0.00224
2026-11-05
0.00224
2026-11-04
0.00224

Intelligence Sources

mitre ref →
nvd ref →

External Links