CVE-2026-29781: Sliver is a command and control framework that uses a custom Wireguard netstack

Q: How do I fix CVE-2026-29781?

sliver: upgrade to newer than 1.7.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-29781 being exploited?

CVE-2026-29781 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-29781 affect?

CVE-2026-29781 affects sliver. Severity is medium (CVSS 6.5). Sliver is a command and control framework that uses a custom Wireguard netstack. In versions from 1.7.3 and prior, a vulnerability exists in the Sliver C2 server's Protobuf unmarshalling logic due to a systemic lack of nil-pointer validatio

Q: How urgent is CVE-2026-29781?

Priority 39/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-29781 is a medium-severity flaw (CVSS 6.5) affecting sliver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Sliver is a command and control framework that uses a custom Wireguard netstack. In versions from 1.7.3 and prior, a vulnerability exists in the Sliver C2 server's Protobuf unmarshalling logic due to a systemic lack of nil-pointer validation. By extracting valid implant credentials and omitting nested fields in a signed message, an authenticated actor can trigger an unhandled runtime panic. Because the mTLS, WireGuard, and DNS transport layers la

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-476
Published	2026-03-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: bishopfox

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-07 16:15 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

bishopfox sliver UPGRADE

Affected: <= 1.7.3

Fixed in: newer than 1.7.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sliver || rpm -q sliver || sliver --version

2. UPGRADE to newer than 1.7.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sliver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sliver

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29781?

sliver: upgrade to newer than 1.7.3. Exact commands for each OS are on this page.

Is CVE-2026-29781 being exploited?

CVE-2026-29781 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29781 affect?

CVE-2026-29781 affects sliver. Severity is medium (CVSS 6.5). Sliver is a command and control framework that uses a custom Wireguard netstack. In versions from 1.7.3 and prior, a vulnerability exists in the Sliver C2 server's Protobuf unmarshalling logic due to a systemic lack of nil-pointer validatio

How urgent is CVE-2026-29781?

Priority 39/100. Public exploit reference

Software pages

WireGuard vulnerabilities

Related CVEs

CVE-2026-32941 MEDIUM 6.5 UPGRADE Sliver is a command and control framework that uses a custom Wireguard netstack
CVE-2026-25760 MEDIUM 6.5 UPGRADE Sliver is a command and control framework that uses a custom Wireguard netstack

References

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