CVE-2026-62898
HIGH 7.5Use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.
ELEVATED IMPACT
Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
1.1%chance of exploitation in 30 days · 63rd percentile
○ In CISA KEV
○ Public exploit / PoC
Impact if exploited
7.5CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityNone
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-62898/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-62898/poc.json
Affected
Vendors Microsoft
Products .Net 10.0 .Net 8.0 .Net 9.0 Microsoft Visual Studio 2022 Version 17.14 Microsoft Visual Studio 2026 Version 18.8 Visual Studio 2022 Visual Studio 2026 .Net
Weakness (CWE)
- CWE-416: : Use After Free
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Microsoft | Visual Studio 2022 | ≥ 17.14.0 and < 17.14.38 |
| Microsoft | Visual Studio 2026 | ≥ 18.8.0 and < 18.8.3 |
| Microsoft | .Net | ≥ 8.0.0 and < 8.0.30 |
| Microsoft | .Net | ≥ 9.0.0 and < 9.0.19 |
| Microsoft | .Net | ≥ 10.0.0 and < 10.0.11 |
All CVSS metrics
- HIGH 7.5 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - HIGH 7.5 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N