Secuno
ENNL
Book demo

CVE-2026-23530

Freerdp buffer overflow

9.8 CRITICALPublic exploitEPSS 0.52%
  1. Published19 Jan 2026

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0,`freerdp_bitmap_decompress_planar` does not validate `nSrcWidth`/`nSrcHeight` against `planar->maxWidth`/`maxHeight` before RLE decode. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Freerdp< 3.21.0

Remediation

Fixed in
Freerdp≥ 3.21.0

References

and 11 more references

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-148888.1
IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0…
CVE-2026-142699.8
IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0…
CVE-2026-764719.8
A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an…
CVE-2026-465708.1
In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_index_walk_down() in…
CVE-2026-1062928.3
Buffer overflow in Fonts in Google Chrome prior to 155.0.8059.39 allowed a remote…
CVE-2026-1062478.3
Buffer overflow in ANGLE in Google Chrome prior to 155.0.8059.39 allowed a remote…

Frequently asked

Is CVE-2026-23530 being actively exploited?

CVE-2026-23530 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.52%.

How severe is CVE-2026-23530?

CVE-2026-23530 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.52% probability of exploitation.

Which products are affected by CVE-2026-23530?

Affected products include Freerdp.

How do I fix CVE-2026-23530?

Upgrade affected software to a fixed version, for example Freerdp 3.21.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-23530 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.