How severe is CVE-2026-83748?

CVE-2026-83748 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-83748 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-83748?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-83748 published?

CVE-2026-83748 was published on 2026-10-13 and last updated on 2026-10-16.

CVE-2026-83748

CVE-2026-83748 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-122
Published: 2026-10-13
Last modified: 2026-10-16

Description

Heap-based buffer overflow in Windows Error Reporting allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-83748?: Heap-based buffer overflow in Windows Error Reporting allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-83748?: CVE-2026-83748 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-83748 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-83748?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-83748 published?: CVE-2026-83748 was published on 2026-10-13 and last updated on 2026-10-16.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83748

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities

CVE-2026-10747 — Critical (CVSS 10.0): IBM MQ Appliance could allow a remote attacker to cause a denial of service or potentially execute arbitrary code due…
CVE-2026-46752 — Critical (CVSS 10.0): Redis Lua HEAP overflow in cjson library vulnerability in Apache Kvrocks. This issue affects Apache Kvrocks: from…
CVE-2026-24822 — Critical (CVSS 10.0): Out-of-bounds Write, Heap-based Buffer Overflow vulnerability in ttttupup wxhelper (src modules). This vulnerability is…
CVE-2025-23123 — Critical (CVSS 10.0): A malicious actor with access to the management network could execute a remote code execution (RCE) by exploiting a…
CVE-2022-34819 — Critical (CVSS 10.0): A vulnerability has been identified in SIMATIC CP 1242-7 V2 (All versions < V3.3.46), SIMATIC CP 1243-1 (All versions <…
CVE-2026-10858 — Critical (CVSS 9.9): IBM MQ for HPE NonStop 8.1.0 through 8.1.0.40 could allow an authenticated attacker to cause a denial of service or…

Browse all CWE-122 (Heap-based Buffer Overflow) vulnerabilities →