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TI-2026-25389 Aliases CVE-2026-32941GHSA-97vp-pwqj-46qc

Sliver Vulnerable to Authenticated OOM via Memory Exhaustion in mTLS/WireGuard Transports

Priority MEDIUM 59CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

Sliver is a command and control framework that uses a custom Wireguard netstack. Versions 1.7.3 and below contain a Remote OOM (Out-of-Memory) vulnerability in the Sliver C2 server's mTLS and WireGuard C2 transport layer. The socketReadEnvelope and socketWGReadEnvelope functions trust an attacker-controlled 4-byte length prefix to allocate memory, with ServerMaxMessageSize allowing single allocations of up to ~2 GiB. A compromised implant or an attacker with valid credentials can exploit this by sending fabricated length prefixes over concurrent yamux streams (up to 128 per connection), forcing the server to attempt allocating ~256 GiB of memory and triggering an OS OOM kill. This crashes the Sliver server, disrupts all active implant sessions, and may degrade or kill other processes sharing the same host. The same pattern also affects all implant-side readers, which have no upper-bound check at all. The issue was not fixed at the the time of publication.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00317 24th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
BishopFoxsliverup to 1.7.3—No fix listedCNA
—github.com/bishopfox/sliver (Go)up to 1.7.3—No fix listedGHSA-97vp-pwqj-46qc
  • sliver VendorBishopFox Affected up to 1.7.3 Fixed in — No fix listed CNA
  • github.com/bishopfox/sliver (Go) Vendor— Affected up to 1.7.3 Fixed in — No fix listed GHSA-97vp-pwqj-46qc

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:*up to 1.7.3VulnerableBishopFox
  • cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:* Versions up to 1.7.3 Vulnerable ·BishopFox

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-32941
  2. 2026-10-03 Alias added: GHSA-97vp-pwqj-46qc

References

Exploit 1

Advisory 1

Other 2

  • TI-2025-19960 Server-Side Request Forgery (SSRF) in sliver teamserver CVSS 4.0MEDIUM 6.9
  • TI-2023-17391 Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows… CVSS 3.1HIGH 8.1
  • TI-2026-26522 Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface CVSS 4.0MEDIUM 5.9
  • TI-2026-23367 Sliver: Authenticated Nil-Pointer Dereference in Handlers CVSS 4.0LOW 2.1
  • TI-2026-20855 Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service CVSS 3.1HIGH 7.5
  • TI-2026-20827 Website Path Traversal / Arbitrary File Read (Authenticated) in Sliver CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences