CVE-2026-62958
libriscv: Out of bounds read vuln in the ELF parser (Denial of service)
- Published
- Oct 30, 2026
- Updated
- Oct 30, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 8, 2026
Primary CVSS
cvelist · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:HLow · next 30 days
- Percentile
- 10.5%
- Model date
- Oct 31, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
Proof-of-concept for CVE-2026-62958: crafts a malformed ELF to trigger an out-of-bounds read in Libriscv and crash the sandbox with SIGSEGV.
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