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CVE-2026-25793

27
FAUCET Score

CVE-2026-25793 affects Nebula versions 1.7.0 to 1.10.2 when configured with P256 certificates, allowing an attacker to bypass blocklist entries through ECDSA Signature Malleability. This high-severity vulnerability (CVSS 8.1) has a low attack complexity and can lead to high confidentiality and integrity impacts, as it enables unauthorized network access despite blocklist attempts. While no active exploitation or public exploit code is currently reported, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the security community. The issue has been patched in Nebula version 1.10.3.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.7.0, < 1.10.3CPE matchmatch criteria
cpe:2.3:a:slack:nebula:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

7.6HIGH

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.13%
Probability of exploitation in next 30 days
EPSS Percentile
3.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0013 is in the 0th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/slackhq/nebulaFixed in: 1.10.3

Vendor Advisories (2)

redhatCVE-2026-25793Important

nebula: Nebula: Blocklist evasion via ECDSA Signature Malleability

Feb 6, 2026
goGHSA-69x3-g4r3-p962high

Blocklist Bypass possible via ECDSA Signature Malleability

Feb 6, 2026

References

github.com / slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21
Patch
github.com / slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962
Vendor Advisory