CVE-2026-77622

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    CVE-2026-77622

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

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

    Details: 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/BishopFox/sliver/releases/tag/v1.7.6, https://github.com/BishopFox/sliver/security/advisories/GHSA-663m-7x7m-g4fw, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77622.json, https://nvd.nist.gov/vuln/detail/CVE-2026-77622, https://github.com/BishopFox/sliver/commit/80273462bd8b2a3cd724d2d6d0301a0cabfa977d

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -902999493be2c6db4c95696f6421c05d75f148a8

    Affected versions

    v1.7.5
    v1.7.4
    v1.7.3
    v1.7.2
    v1.7.1
    v1.7.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-77622 | CVE-DB