Is there a public exploit for CVE-2026-62958?

Yes. Proof-of-concept code for CVE-2026-62958 has been published publicly.

Is there a proof of concept for CVE-2026-62958?

Yes — 1 proof-of-concept entry is linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2026-62958?

CVE-2026-62958 scores CVSS 7.9 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.21%.

What does CVE-2026-62958 affect?

CVE-2026-62958 affects libriscv libriscv.

7.9 High

libriscv is a RISC-V sandbox and emulator.

CVE-2026-62958

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 ::binaryloader checks PTLOAD program-header bounds, but Memory ::serializeexecutesegment trusts section-header shoffset and shsize when locating .text without verifying the file range against mbinary.size(); Memory ::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 createexecutesegment(), 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.

Proof-of-concept code is published

Public PoC

Public PoC0Linear/CVE-2026-62958

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 7.9 (v3.1)
Severity: High
EPSS: 0.21% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 30 October 2026
Last updated: 2 November 2026
Affected: libriscv · libriscv
Assigner: GitHub_M

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

At the source

EUVD (ENISA)

References

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

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