Vulnerability in Rust Openssl Project (CVE-2026-41676)
Summary
Vulnerability in Rust Openssl Project (CVE-2026-41676). Risk of unauthorized operations or information disclosure. 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 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and HKDF-extract ignore the incoming *keylen, unconditionally writing the full shared secret (32/56/prime-size bytes). A caller passing a short slice gets a heap/stack overflow from safe code. OpenSSL 3.x providers do check, so this only impacts older OpenSSL. 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-2026-41676 has been found in Rust Openssl Project.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
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-2026-41676" on the vendor's site.
CVE-2026-41676 (Rust Openssl Project) — CWE-131 / CVSS v3 7.5
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.
A vulnerability (CWE-131) exists in Rust Openssl Project.
Check the vendor advisory for the affected versions of Rust Openssl Project.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
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-2026-41676 rust-openssl
- Ubuntu UBUNTU-CVE-2026-41676 rust-openssl