# CVE-2026-58107: Authenticated Remote Denial of Service via Unbounded zlib Decompression in massStoreRun

> Authenticated users can cause denial of service in CodeChecker by submitting highly compressed payloads that exhaust memory and disk space during decompression.

- **Severity:** Medium 5.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/S:N/AU:Y/R:A/RE:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Aug 2026
- **Updated:** 28 Aug 2026
- **Also known as:** GHSA-w7jw-x567-hqr4

## What is CVE-2026-58107?

CVE-2026-58107 is a medium-severity denial of service vulnerability in Ericsson CodeChecker, published on 28 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

CodeChecker's massStoreRun processing path performs one-shot decompression of attacker-controlled, Base64-encoded zlib data without enforcing a maximum decompressed size.

An authenticated user with permission to store analysis runs can submit a highly compressed payload that expands to a significantly larger byte sequence. Because the entire decompressed output is materialized in memory before being written to a temporary file, a sufficiently large payload may exhaust process or host memory and consume substantial disk space, resulting in denial of service.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling), CWE-409 (Improper Handling of Highly Compressed Data (Data Amplification))

## Which versions are affected by CVE-2026-58107?


## How do I fix CVE-2026-58107?

No fix has been published for CVE-2026-58107 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-58107 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58107 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-58107 and fix it if it is affected.

What it is: CVE-2026-58107 is a medium-severity denial of service vulnerability in Ericsson CodeChecker, published on 28 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58107 exists.

Affected product: Ericsson CodeChecker. 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-2026-58107/ (Markdown: https://insights.sbomify.com/CVE-2026-58107/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-58107
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-58107
- OSV: https://osv.dev/vulnerability/CVE-2026-58107

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-58107/
Summaries are generated and may contain mistakes; the official description above is the record.