Out-of-Bounds Write in Rust Openssl Project (CVE-2026-41678)
Summary
Out-of-bounds write in Rust Openssl Project (CVE-2026-41678). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 0.10.78 or later.
Original description
The description as published by the source.
rust-openssl provides OpenSSL bindings for the Rust programming language. From to before 0.10.78, aes::unwrap_key() contains an incorrect assertion: it checks that out.len() + 8 <= in_.len(), but this condition is reversed. The intended invariant is out.len() >= in_.len() - 8, ensuring the output buffer is large enough. Because of the inverted check, the function only accepts buffers at or below the minimum required size and rejects larger ones. If a smaller buffer is provided the function will write past the end of out by in_.len() - 8 - out.len() bytes, causing an out-of-bounds write from a safe public function. This vulnerability is fixed in 0.10.78.
Source: NIST National Vulnerability Database NVD
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-2026-41678 has been found in Rust Openssl Project.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: upgrade Rust Openssl Project to 0.10.78 or later.
If unsure, ask your IT team or search "Rust Openssl Project CVE-2026-41678" on the vendor's site.
CVE-2026-41678 (Rust Openssl Project) — CWE-787 / CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 0.10.78 — 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.
Out-of-bounds write (CWE-787) exists in Rust Openssl Project.
Check the vendor advisory for the affected versions of Rust Openssl Project.
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover.
Update to 0.10.78.
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. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Rust Openssl Project を使っているサービスとバージョンを洗い出す。
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2Apply patch patch
Upgrade Rust Openssl Project to 0.10.78ステージング環境で 0.10.78 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。
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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。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-41678 rust-openssl
- Ubuntu UBUNTU-CVE-2026-41678 rust-openssl