CVE-2026-77622

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.

References

https://github.com/Squ1shification/PNGboomer-CVE-2026-77622

https://github.com/BishopFox/sliver/security/advisories/GHSA-663m-7x7m-g4fw

https://github.com/BishopFox/sliver/releases/tag/v1.7.6

https://github.com/BishopFox/sliver/commit/80273462bd8b2a3cd724d2d6d0301a0cabfa977d

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-117798

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS