🛡️ CVE-2019-11842 — matrix-sydent

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-338 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG

An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1. Random number generation is mishandled, which makes it easier for attackers to predict a Sydent authentication token or a Synapse random ID.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2019-11842 is classified as CWE-338: Use of Cryptographically Weak PRNG. A general-purpose random number generator is used where a cryptographic one is required.

Affected software

CVE-2019-11842 is recorded against 2 packages.

  • matrix-sydent (fixed in 1.0.3)
  • matrix-synapse (fixed in 0.99.3.1)

Timeline and source

Published on 24 May 2022 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Advisory)
github.com (Web)
matrix.org (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CWE CWE-338
Public Exploit ✅ No
Source OSV
Published 2022-05-24
Updated 2026-08-12
Modified 2026-07-13
Fix URL N/A

Affected Packages

Software From version Fixed in
matrix-sydent — 1.0.3
matrix-synapse — 0.99.3.1

Similar Threats

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