CVE-2026-128242
Published:November 13, 2026
Updated:November 13, 2026
actix-http before 3.20.1 and actix-web before 4.18.2 contain an unbounded decompression vulnerability in encoding::Decoder that lets remote attackers exhaust memory and CPU via compressed bodies. Attackers can send small highly compressed gzip, deflate, Brotli or zstd request bodies to Json, Form, Bytes or String extractors, or serve them to awc clients, causing denial of service.
Affected Packages
https://github.com/actix/actix-web.git (GITHUB):
Affected version(s) >=v1.0.0-alpha.6 <actix-web-v4.18.2 || >=web-v1.0.0-beta.2 <actix-web-v4.18.2 || >=v2.0.0-alpha.1 <actix-web-v4.18.2 || >=web-v2.0.0-rc <actix-web-v4.18.2 || >=web-v3.0.0-alpha.1 <actix-web-v4.18.2 || >=web-v4.0.0-beta.1 <actix-web-v4.18.2 || >=actix-web-v4.16.0 <actix-web-v4.18.2Fix Suggestion:
Update to version actix-web-v4.18.2https://github.com/actix/actix-web.git (GITHUB):
Affected version(s) >=http-v0.1.0-alpha.1 <actix-http-v3.20.1 || >=http-v1.0.0 <actix-http-v3.20.1 || >=http-v2.0.0-alpha.1 <actix-http-v3.20.1 || >=http-v3.0.0-beta.1 <actix-http-v3.20.1 || >=actix-http-v3.18.13 <actix-http-v3.20.1Fix Suggestion:
Update to version actix-http-v3.20.1actix-web (RUST):
Affected version(s) >=4.0.0-beta.1 <4.18.2 || >=2.0.0-alpha.1 <4.18.2 || >=1.0.0-alpha.6 <4.18.2 || >=3.0.0-alpha.1 <4.18.2Fix Suggestion:
Update to version 4.18.2actix-http (RUST):
Affected version(s) >=3.0.0-beta.1 <3.20.1 || >=2.0.0-alpha.1 <3.20.1 || >=0.1.0-alpha.1 <3.20.1 || >=1.0.0-alpha.3 <3.20.1Fix Suggestion:
Update to version 3.20.1Related Resources (10)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Handling of Highly Compressed Data (Data Amplification)