How severe is CVE-2026-33986?

CVE-2026-33986 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33986 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33986?

CVE-2026-33986 affects Freerdp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33986?

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

Does CVE-2026-33986 have an EU (EUVD) identifier?

Yes. CVE-2026-33986 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17233.

When was CVE-2026-33986 published?

CVE-2026-33986 was published on 2026-03-30 and last updated on 2026-06-30.

CVE-2026-33986

CVE-2026-33986 is a high-severity vulnerability in Freerdp with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17233
Weakness: CWE-122
Affected product: Freerdp
Published: 2026-03-30
Last modified: 2026-06-30

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.

Frequently asked questions

What is CVE-2026-33986?: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.
How severe is CVE-2026-33986?: CVE-2026-33986 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33986 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33986?: CVE-2026-33986 affects Freerdp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33986?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33986 have an EU (EUVD) identifier?: Yes. CVE-2026-33986 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17233.
When was CVE-2026-33986 published?: CVE-2026-33986 was published on 2026-03-30 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

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