# CVE-2026-115319: fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents


- **Severity:** Low 2.0 (`CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 22 Oct 2026
- **Updated:** 29 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-115319, GHSA-9q8r-c9q4-p63h, UBUNTU-CVE-2026-115319

## What is CVE-2026-115319?

CVE-2026-115319 is a low-severity vulnerability in junegunn fzf, published on 22 Oct 2026. 

### Official description

fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in maskActionContents that allows local attackers to exhaust the --listen HTTP server through quadratic string concatenation. Attackers can repeatedly send POST bodies of about 1 MB to the unauthenticated localhost port, blocking the single-threaded server for about 30 seconds each time.

Weakness: CWE-407 (Inefficient Algorithmic Complexity)

## Which versions are affected by CVE-2026-115319?


## How do I fix CVE-2026-115319?

No fix has been published for CVE-2026-115319 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-115319 being exploited?

There is no known exploitation of CVE-2026-115319 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-115319 and fix it if it is affected.

What it is: CVE-2026-115319 is a low-severity vulnerability in junegunn fzf, published on 22 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-115319 in the wild and no public exploit code.

Affected product: junegunn fzf. 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-2026-115319/ (Markdown: https://insights.sbomify.com/CVE-2026-115319/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-115319
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-115319
- OSV: https://osv.dev/vulnerability/CVE-2026-115319

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-115319/
Summaries are generated and may contain mistakes; the official description above is the record.