CVE-2026-77622

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.

• https://github.com/BishopFox/sliver/commit/80273462bd8b2a3cd724d2d6d0301a0cabfa977d
• https://github.com/BishopFox/sliver/releases/tag/v1.7.6
• https://github.com/BishopFox/sliver/security/advisories/GHSA-663m-7x7m-g4fw

• https://github.com/BishopFox/sliver/commit/80273462bd8b2a3cd724d2d6d0301a0cabfa977d
• https://github.com/BishopFox/sliver/releases/tag/v1.7.6
• https://github.com/BishopFox/sliver/security/advisories/GHSA-663m-7x7m-g4fw

• HIGHCVE-2023-54404PoC
• MEDIUMCVE-2025-12767
• MEDIUMCVE-2025-36061
• UNSCOREDCVE-2025-8352
• MEDIUMCVE-2026-100274
• UNSCOREDCVE-2026-100302
• MEDIUMCVE-2026-100350PoC
• MEDIUMCVE-2026-100508

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