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High · 8.2 Public exploit CVE-2026-77622 EUVD-2026-117798GHSA-663m-7x7m-g4fwGO-2026-6777

Sliver: Unauthenticated Memory Exhaustion Denial of Service in Sliver HTTP(S) Listener PNG Decoder

Published Nov 5, 2026 · Updated Nov 9, 2026 · Assigned by GitHub_M

Vendor: BishopFox Product: sliver Package: github.com/bishopfox/sliver Ecosystem: Go

Description

Sliver is a command and control framework. Prior to 1.7.6, an HTTP(S) listener using the PNG encoder accepts attacker-controlled PNG dimensions without an effective decoded-size or pixel limit in util/encoders/images.go, while the listener nonce space implemented in server/encoders/encoders.go is small enough to search remotely. An unauthenticated attacker who identifies a valid nonce can submit a highly compressed image to PNGEncoder.Decode, where it expands during png.Decode, exhausting server memory and causing a complete loss of availability. This vulnerability is fixed in 1.7.6.

Affected products

VendorProductAffectedFixed
BishopFox sliver < 1.7.6 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Affected packages

EcosystemPackageAffectedFixedRecord
Go github.com/BishopFox/sliver < 1.7.6 1.7.6 GHSA-663m-7x7m-g4fw
Go github.com/bishopfox/sliver < 1.7.6 1.7.6 GO-2026-6777

References