Vulnerability details
CVE-2026-77622
BishopFox sliver
Sliver: Unauthenticated Memory Exhaustion Denial of Service in Sliver HTTP(S) Listener PNG Decoder
CVSS 4.0
8.2High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| BishopFox | sliver | < 1.7.6 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/BishopFox/sliver/security/advisories/GHSA-663m-7x7m-g4fw x_refsource_CONFIRM
- https://github.com/BishopFox/sliver/commit/80273462bd8b2a3cd724d2d6d0301a0cabfa977d x_refsource_MISC
- https://github.com/BishopFox/sliver/releases/tag/v1.7.6 x_refsource_MISC
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Details
- Published
- 2026-11-06
- Last updated
- 2026-11-06
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.53%
Probability of exploitation in 30 days
45.2%
Percentile (among all CVEs)
Weaknesses (CWE)
- CWE-770Allocation of Resources Without Limits or Throttling