CVE-2026-77157 ast-cli: Auto-update downloads are not verified against a checksum before execution
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-77157?
CVE-2026-77157 is a medium-severity vulnerability in github.com/checkmarx/ast-cli, published on 22 Oct 2026.
Official description
ast-cli downloads two helper binaries, the Vorpal ASCA real-time engine and the SCA Resolver, from "download.checkmarx.com" as part of its auto-update flow, triggered by the Checkmarx’s "VSCode/JetBrains" extensions and by cx scan "sca-realtime".
Prior to the fix, the downloaded archive was not verified against a checksum before extraction and execution. An attacker able to substitute the served archive could deliver an arbitrary binary that ast-cli would extract and execute the contents of the archive, since no integrity check was performed on the download.
Successful exploitation requires compromising "download.checkmarx.com" and replacing the served archive with one containing an attacker-controlled binary. If the served archive had been replaced that way, any developer machine or CI pipeline invoking ASCA (via Checkmarx's VSCode/JetBrains extensions) or cx scan "sca-realtime" on an affected version would have extracted and executed that binary in place of the intended download.
The download is now verified against a published SHA-256 checksum before extraction.
Weakness: CWE-353
Which versions are affected by CVE-2026-77157?
How do I fix CVE-2026-77157?
No fix has been published for CVE-2026-77157 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77157 being exploited?
There is no known exploitation of CVE-2026-77157 in the wild and no public exploit code.
Sources
Also known as GHSA-vf6p-x2fw-5hcg.