# CVE-2026-70377: imagecli - Uncontrolled Memory Allocation via Unbounded scale Ratio Causes Denial of Service

> Attackers can cause denial of service in applications using imagecli by supplying unbounded scale ratios that trigger excessive memory allocation.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Aug 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-6mc8-mx43-h2qw

## What is CVE-2026-70377?

CVE-2026-70377 is a high-severity denial of service vulnerability in theotherphil imagecli, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

imagecli's pipeline operation (Scale::apply in src/image_ops.rs) computes output width/height as (dimension as f32 * ratio) as u32 with no upper-bound validation on the CLI-supplied ratio, which is parsed via nom::number::complete::float with no range check. Any application embedding imagecli as a library and accepting user-controlled pipeline strings is remotely crashable with a single request.

Weakness: CWE-789 (Memory Allocation with Excessive Size Value)

## Which versions are affected by CVE-2026-70377?


## How do I fix CVE-2026-70377?

No fix has been published for CVE-2026-70377 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-70377 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-70377 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-70377 and fix it if it is affected.

What it is: CVE-2026-70377 is a high-severity denial of service vulnerability in theotherphil imagecli, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-70377 exists.

Affected product: theotherphil imagecli. 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-2026-70377/ (Markdown: https://insights.sbomify.com/CVE-2026-70377/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-70377
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-70377
- OSV: https://osv.dev/vulnerability/CVE-2026-70377

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-70377/
Summaries are generated and may contain mistakes; the official description above is the record.