Slack vulnerabilities

🔔 Create alert RSS

Published CVEs affecting Slack products: 2 record(s), with severity, exploitation and fixes.

Exploited only (KEV) →

CVE-2026-25793 High · 8.1 CWE-347 Feb 6, 2026

Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability

Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.

CVE-2025-62820 Medium · 4.9 CWE-420 Oct 23, 2025

Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts…

Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.