Executive brief
Visual Studio's DiaSymReader component contains a heap buffer overflow that could allow attackers to execute arbitrary code on a developer's machine. An attacker can exploit this remotely by sending a specially crafted request, potentially compromising developer systems and the code they are working on. This could lead to malware installation, theft of source code or credentials, or supply chain attacks.
Technical details
A heap-based buffer overflow (CWE-122) exists in Microsoft's DiaSymReader.Native NuGet package, a component used by Visual Studio for debugging symbol processing. The vulnerability is triggered over the network (AV:N) with low attack complexity (AC:L) and no privilege requirement (PR:N), but requires user interaction (UI:R). Affected versions are Microsoft.DiaSymReader.Native >= 17.10.0-beta1.24272.1 through 18.9.0-beta1.26405.1, with a fix available in version 18.9.0-beta1.26405.2. Exploitation allows full code execution (CIA:H) with impact to confidentiality, integrity, and availability. This advisory is marked as withdrawn because it duplicates GHSA-63gh-g2x5-x69v.
Affected products
- Microsoft DiaSymReader.Native >= 17.10.0-beta1.24272.1, <= 18.9.0-beta1.26405.1
Timeline
- 2026-09-08: disclosed
- 2026-09-08: advisory: GitHub Advisory GHSA-4qhr-qf46-fcrx published
- 2026-09-09: patched: Patch available in version 18.9.0-beta1.26405.2; advisory withdrawn as duplicate of GHSA-63gh-g2x5-x69v