CVE-2026-33986: FreeRDP is a free implementation of the Remote Desktop Protocol

Q: How do I fix CVE-2026-33986?

freerdp: upgrade to 3.24.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-33986 being exploited?

CVE-2026-33986 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33986 affect?

CVE-2026-33986 affects freerdp. Severity is high (CVSS 7.5). 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_recallo

Routine

HIGH 7.5UPGRADE

CVE-2026-33986 is a high-severity flaw (CVSS 7.5) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-122, CWE-131
Published	2026-03-30
Last modified	2026-07-15

Publisher (CNA): GitHub, Inc. · Vendor: freerdp

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-30 22:16 UTCPublished CVE record published
2026-07-15 02:20 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.24.2

Fixed in: 3.24.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy freerdp || rpm -q freerdp || freerdp --version

2. UPGRADE to 3.24.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freerdp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freerdp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33986?

freerdp: upgrade to 3.24.2. Exact commands for each OS are on this page.

Is CVE-2026-33986 being exploited?

CVE-2026-33986 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33986 affect?

CVE-2026-33986 affects freerdp. Severity is high (CVSS 7.5). 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_recallo

How urgent is CVE-2026-33986?

Priority 31/100. High severity

Software pages

WinRM and RDP vulnerabilities

Related CVEs

CVE-2026-111379 HIGH 7.3 UPGRADE FreeRDP before 3.32.0 contains a heap buffer overflow vulnerability in persistent_cache_read_entry_v3 that all
CVE-2026-109256 MEDIUM 5.3 UPGRADE FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes
CVE-2026-109257 MEDIUM 5.9 DOWNGRADE FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dang
CVE-2026-109940 MEDIUM 4.3 UPGRADE FreeRDP 3.0.0-beta1 before 3.32.0 on Unix builds with PKCS#11 support has a stack-based buffer overflow in wpr
CVE-2026-109939 MEDIUM 6.5 UPGRADE FreeRDP 3.27.1 before 3.32.0 contains a NULL pointer dereference in update_read_cache_bitmap_v3_order() in lib

References

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