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CVE-2026-77622Sliver: Unauthenticated Memory Exhaustion Denial of Service in Sliver HTTP(S) Listener PNG Decoder

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.

8.2 HIGHEPSS 0.53%Not in KEVNVD: Received

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
8.2HIGH4.0GitHub_M (CNA)CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Details

CVE ID
CVE-2026-77622
Status
Received
Assigner (CNA)
GitHub_M
Published
Nov 5, 2026
Last modified
2026-11-05 21:18 UTC
Weaknesses
  • CWE-770 · Allocation of Resources Without Limits or Throttling

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 07:13 UTC.