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CVE-2026-48110: Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-10 · updated 2026-07-23
• Weakness: CWE-20

Description

Russh is a Rust SSH client & server library. From version 0.34.0 to before version 0.61.0, several russh client and server message handlers decoded attacker-controlled SSH strings, name-lists, and byte fields into owned allocations before applying field-specific bounds. A remote SSH peer could send oversized, high-fanout, or malformed length-prefixed fields and make the library allocate, attempt to allocate, or split data before rejecting input that should have been rejected earlier. This issue has been patched in version 0.61.0.

Affected products

• Eugeny russh: from 0.34.0, < 0.61.0

References

• https://github.com/Eugeny/russh/security/advisories/GHSA-4r3c-5hpg-58qr
• https://github.com/Eugeny/russh/security/advisories/GHSA-4r3c-5hpg-58qr

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