# CVE-2026-108954: Memory corruption in sherpa-onnx

> Remote attackers can trigger a buffer overflow in sherpa-onnx via malformed model metadata, potentially leading to code execution or denial of service.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Oct 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-f5q5-vp8g-wh4x

## What is CVE-2026-108954?

CVE-2026-108954 is a medium-severity memory corruption vulnerability in k2-fsa sherpa-onnx, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability was found in k2-fsa sherpa-onnx up to 1.13.8. This issue affects the function OfflineTransducerGreedySearchDecoder::Decode of the file sherpa-onnx/csrc/offline-transducer-greedy-search-decoder.cc of the component Offline Transducer Greedy Search Decoder. The manipulation of the argument vocab_size results in buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used. If only official model packs are used and they always keep metadata consistent with the joiner, the bug may not be reachable in normal supported usage. However, from a security and robustness standpoint, the code still contains the vulnerability because it trusts unvalidated model metadata and can be triggered by a malformed or tampered model pack.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-108954?


## How do I fix CVE-2026-108954?

No fix has been published for CVE-2026-108954 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108954 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108954 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108954 and fix it if it is affected.

What it is: CVE-2026-108954 is a medium-severity memory corruption vulnerability in k2-fsa sherpa-onnx, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108954 exists.

Affected product: k2-fsa sherpa-onnx. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-108954/ (Markdown: https://insights.sbomify.com/CVE-2026-108954/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108954
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108954
- OSV: https://osv.dev/vulnerability/CVE-2026-108954

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-108954/
Summaries are generated and may contain mistakes; the official description above is the record.