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Advisory record · GHSA-69x3-g4r3-p962

Blocklist Bypass possible via ECDSA Signature Malleability

CVSS 7.6 HighEPSS 0.0014 · 3rd percentile

Published by the GitHub Advisory Database at 6 Feb 2026, 20:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/slackhq/nebulaGo>=1.7.0, <1.10.31.10.3
Identifiers
GHSA-69x3-g4r3-p962 · CVE-2026-25793 · GO-2026-4458
Weakness (CWE)
CWE-347
Tags
Published
6 Feb 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Nebula versions 1.7.0 up to 1.10.3 (fixed in 1.10.3) are affected when P256 certificates are used. An attacker who holds the private key and certificate of a blocklisted host can use ECDSA signature malleability to produce a copy with a different fingerprint, evading the blocklist entry. Upgrade to Nebula 1.10.3. The source's workarounds are complex, so the practical alternative is rotating out CAs that signed blocklisted hosts.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.6 High 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0014, the 3rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:43 UTC First seen by agentprime
  2. 31 Oct 2026, 14:43 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.