CVE-2026-123610
Published:November 08, 2026
Updated:November 10, 2026
rustls before 0.23.46 contains an uncontrolled memory allocation flaw in its optional Brotli certificate decompression, which limits decompressed output size but accepts an input-selected large history window. Malicious peers can send a certificate with a five-byte Brotli header requesting up to 1 GiB before authentication, aborting Brotli-enabled clients or client-authenticating servers whose allocator cannot satisfy the request.
Affected Packages
https://github.com/rustls/rustls.git (GITHUB):
Affected version(s) =v/0.24.0-alpha.1 <v/0.24.0-dev.2Fix Suggestion:
Update to version v/0.24.0-dev.2https://github.com/rustls/rustls.git (GITHUB):
Affected version(s) >=v/0.23.9 <v/0.23.46Fix Suggestion:
Update to version v/0.23.46rustls (RUST):
Affected version(s) >=0.23.9 <0.23.46Fix Suggestion:
Update to version 0.23.46rustls (RUST):
Affected version(s) >=0.24.0-dev.0 <0.24.0-dev.2Fix Suggestion:
Update to version 0.24.0-dev.2Related Resources (12)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.17