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CVE-2026-25793

Published: Feb 6, 2026

Modified: Feb 9, 2026

PUBLISHED

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.

Vendor	Product	Versions
slackhq	nebula	affected `>= 1.7.0, < 1.10.3`

Weaknesses (CWE)

References

https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962

x_refsource_CONFIRM

https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21

x_refsource_MISC

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