FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.

The version of freerdp installed on the remote host is prior to 2.11.7-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3238 advisory.

    DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93 (CVE-2026-33952)

    DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5 (CVE-2026-33977)

    Progressive Codec Quant BYTE Underflow - UB + CPU DoS

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478 (CVE-2026-33983)

    ClearCodec resize_vbar_entry() Heap OOB Write

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6 (CVE-2026-33984)

    ClearCodec Glyph Cache Count Desync - Heap OOB Read

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x6gr-8p7h-5h85 (CVE-2026-33985)

    H.264 YUV Buffer Dimension Desync - Heap OOB Write

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97 (CVE-2026-33986)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1549 advisory.

    DoS via WINPR_ASSERT in rts_read_auth_verifier_no_checks

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4v4p-9v5x-hc93 (CVE-2026-33952)

    DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8f2g-3q27-6xm5 (CVE-2026-33977)

    Persistent Cache Allocator Mismatch - Heap OOB Read

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8jm9-2925-g4v2 (CVE-2026-33982)

    Progressive Codec Quant BYTE Underflow - UB + CPU DoS

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478 (CVE-2026-33983)

    ClearCodec resize_vbar_entry() Heap OOB Write

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8469-2xcx-frf6 (CVE-2026-33984)

    ClearCodec Glyph Cache Count Desync - Heap OOB Read

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x6gr-8p7h-5h85 (CVE-2026-33985)

    H.264 YUV Buffer Dimension Desync - Heap OOB Write

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97 (CVE-2026-33986)

    Persistent Cache bmpSize Desync - Heap OOB Write

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ff8h-p5vc-wcwc (CVE-2026-33987)

    double free in kerberos_AcceptSecurityContext and kerberos_IntitalizeSecurityContextA

    NOTE: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mv25-f4p2-5mxx (CVE-2026-33995)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-07418a381f advisory.

    Update to 3.24.2

    It fixes CVE-2026-33952, CVE-2026-33977, CVE-2026-33982, CVE-2026-33983,     CVE-2026-33984, CVE-2026-33985, CVE-2026-33986, CVE-2026-33987 and     CVE-2026-33995.

    ----

    Update to 3.24.0 (CVE-2026-29774, CVE-2026-29775, CVE-2026-29776, CVE-2026-31806, CVE-2026-31883,     CVE-2026-31884, CVE-2026-31885, CVE-2026-31897)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f6fe509803 advisory.

    Update to 3.24.2

    It fixes CVE-2026-33952, CVE-2026-33977, CVE-2026-33982, CVE-2026-33983,     CVE-2026-33984, CVE-2026-33985, CVE-2026-33986, CVE-2026-33987 and     CVE-2026-33995.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-36ea367760 advisory.

    Update to 3.24.2

    It fixes CVE-2026-33952, CVE-2026-33977, CVE-2026-33982, CVE-2026-33983,     CVE-2026-33984, CVE-2026-33985, CVE-2026-33986, CVE-2026-33987 and     CVE-2026-33995.


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in     resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the     winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old,     smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The     caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing     a heap buffer overflow. This issue has been patched in version 3.24.2. (CVE-2026-33984)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
306291	Amazon Linux 2 : freerdp, --advisory ALAS2-2026-3238 (ALAS-2026-3238)	Nessus	Amazon Linux Local Security Checks	medium
306209	Amazon Linux 2023 : freerdp, freerdp-devel, freerdp-libs (ALAS2023-2026-1549)	Nessus	Amazon Linux Local Security Checks	medium
304936	Fedora 42 : freerdp (2026-07418a381f)	Nessus	Fedora Local Security Checks	critical
304442	Fedora 43 : freerdp (2026-f6fe509803)	Nessus	Fedora Local Security Checks	medium
304350	Fedora 44 : freerdp (2026-36ea367760)	Nessus	Fedora Local Security Checks	medium
303836	Linux Distros Unpatched Vulnerability : CVE-2026-33984	Nessus	Misc.	high

Detections

Analytics

CVE-2026-33984

high

Tenable Plugins

medium

medium

critical

medium

medium

high