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CVE-2026-48110 Eugeny CVE debrief

CVE-2026-48110 is a vulnerability in the Russh Rust SSH client & server library. The issue affects versions from 0.34.0 up to but not including 0.61.0. In these versions, the library's handling of certain SSH messages could lead to excessive memory allocation or attempts at allocation when processing attacker-controlled strings, name-lists, and byte fields. This could be exploited by a remote SSH peer to cause a denial-of-service (DoS) by sending oversized, high-fanout, or malformed length-prefixed fields.

Vendor
Eugeny
Product
russh
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Developers and administrators using the Russh library in their applications, especially those providing SSH services, should be aware of this vulnerability. The vulnerability has been patched in version 0.61.0 of the Russh library.

Technical summary

The vulnerability arises from the library's practice of decoding attacker-controlled SSH strings, name-lists, and byte fields into owned allocations before applying field-specific bounds checks. This could allow an attacker to cause the library to allocate, attempt to allocate, or split data improperly, leading to potential DoS conditions.

Defensive priority

HIGH

Recommended defensive actions

  • Update to version 0.61.0 or later of the Russh library to apply the patch.
  • Review and restrict SSH access to only trusted peers to minimize exposure.

Evidence notes

The CVE has a CVSS score of 7.5 and is considered HIGH severity. It was published on 2026-06-10T22:17:01.267Z and last modified on 2026-06-11T17:16:34.917Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48110 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48110

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-48110 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48110

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.