CVE-2026-62958

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{"affected": [{"affectedData": [{"product": "libriscv", "vendor": "libriscv", "versions": [{"status": "affected", "version": "< 1.18"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "libriscv is a RISC-V sandbox and emulator. Prior to 1.18, a crafted ELF binary can cause out-of-bounds reads in the host emulator. `Memory<W>::binary_loader` checks `PT_LOAD` program-header bounds, but `Memory<W>::serialize_execute_segment` trusts section-header `sh_offset` and `sh_size` when locating `.text` without verifying the file range against `m_binary.size()`; `Memory<W>::lookup()` has a similar section-table problem. Malformed `.text` or `.symtab` offsets can therefore bypass the program-header checks and point outside the binary buffer, crashing rvlinux. With suitable memory layout or integer overflow, out-of-buffer host heap memory may instead be mapped into the guest by `create_execute_segment()`, potentially exposing host memory. The reported reproducer demonstrates a host SIGSEGV, while memory disclosure through grooming is described as possible rather than demonstrated. This issue is fixed in version 1.18."}], "id": "CVE-2026-62958", "lastModified": "2026-11-02T19:35:33.347", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.9, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-62958", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-02T14:54:34.516881Z", "version": "2.0.3"}}]}, "published": "2026-10-30T21:17:14.840", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/libriscv/libriscv/commit/61ef9ca82c8876dd80b33780893ba512af780e93"}, {"source": "security-advisories@github.com", "url": "https://github.com/libriscv/libriscv/commit/7bd1c189f9f9d54368cde096b07b194ad680f9fa"}, {"source": "security-advisories@github.com", "url": "https://github.com/libriscv/libriscv/releases/tag/v1.18"}, {"source": "security-advisories@github.com", "url": "https://github.com/libriscv/libriscv/security/advisories/GHSA-gm4g-6c78-gr3w"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/libriscv/libriscv/security/advisories/GHSA-gm4g-6c78-gr3w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.18)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "libriscv", "source": "cna", "vendor": "libriscv"}, "product": "libriscv", "vendor": "libriscv"}], "created": "2026-10-30T22:30:14.369588+00:00", "updated": "2026-10-30T22:47:57.696427+00:00", "vendors": ["libriscv", "libriscv$PRODUCT$libriscv"]}