Vulnerability in russh (CVE-2026-48110)
Summary
Vulnerability in russh (CVE-2026-48110). Risk of unauthorized operations or information disclosure. Exploitable via russh. Mitigation: upgrade to 0.61.0 or later.
Original description
The description as published by the source.
SSH message fields were decoded through allocation-first parsers before field-specific bounds
Summary
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.
Affected Versions
Oldest verified exploitable stable release: russh 0.34.0.
- Historical stronger case:
russh >= 0.34.0, < 0.58.0. These releases have the allocation-first KEXINIT field parsing issue and still useCryptoVecfor inbound packet/decompression buffers. A peer can combine negotiated RFCzlib, rekey, compressed KEXINIT expansion, historicalCryptoVecdecompression growth, and KEXINIT name-list fanout. - Current maintained-line case:
russh >= 0.58.0, including0.60.2. These releases moved non-secret packet/decompression buffers offCryptoVec, but the allocation-first SSH field parser issue remains reachable as aVec/String/name-list resource exhaustion issue.
Prerelease coverage was not claimed for the zlib/CryptoVec/KEXINIT combo because the combined historical exploit shape was verified against stable v0.34.0-era code and reproduced the stress behavior on v0.57.1.
Details
The affected parser pattern appeared across the SSH…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-48110 has been found in russh.
Attackers can target a specific entry point like russh over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade russh to 0.61.0 or later.
If unsure, ask your IT team or search "russh CVE-2026-48110" on the vendor's site.
CVE-2026-48110 (russh) — CWE-20 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: russh / CryptoVec / zlib / Vec
Patched: 0.61.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-20) exists in russh. Attackers reach the vulnerable code path via russh without authentication.
Check the vendor advisory for the affected versions of russh. Attack surface: russh / CryptoVec / zlib / Vec.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 0.61.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'russh' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'russh' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
russhを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade russh to 0.61.0ステージング環境で 0.61.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-48110 rust-russh
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com