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Vulnerability · Published Oct 30, 2026 · Assigned by GitHub_M

CVE-2026-62958libriscv: Out of bounds read vuln in the ELF parser (Denial of service)

High 7.9

In plain English

A high-severity improper input validation in libriscv from libriscv. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)7.9High
Exploit odds (30 days)0.2%top 89.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC

Official description

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.

Affected products (as reported)

VendorProductVersions
libriscv libriscv < 1.18

Weakness: CWE-20, CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

References