CVE-2025-66622

LOW EPSS 26.4%
Published Dec 9, 20256mo ago · Modified Jun 17, 20261w ago
1.3 CVSS 4.0
Low
Find Similar
Published Dec 9, 2025 6mo ago
Last Modified Jun 17, 2026 1w ago

Description

matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.

CVSS Details

Base Score
1.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
26.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-755

Affected Products 1

VendorProductVersionRange
matrixmatrix-rust-sdk* <0.16.0

References 4

  • github.com https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0
    Patch
  • github.com https://github.com/matrix-org/matrix-rust-sdk/pull/5924
    Issue TrackingPatch
  • github.com https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3
    PatchVendor Advisory
  • rustsec.org https://rustsec.org/advisories/RUSTSEC-2025-0135.html
    Third Party Advisory

Remediation

  • github.com https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0
    Patch
  • github.com https://github.com/matrix-org/matrix-rust-sdk/pull/5924
    Issue TrackingPatch
  • github.com https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3
    PatchVendor Advisory