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CVE PROGRAM SOURCE RECORD7.6 High

CVE-2026-25793

Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

slackhq nebula

  • >= 1.7.0, < 1.10.3affected

References