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CVE Vulnerabilities

CVE-2026-33983

Integer Overflow or Wraparound

Published: Mar 30, 2026 | Modified: Jul 15, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-33983
CWEhttps://cwe.mitre.org/data/definitions/190.html

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.

Weakness

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected Software

NameVendorStart VersionEnd Version
FreerdpFreerdp*3.24.2 (excluding)
Red Hat Enterprise Linux 10RedHatfreerdp-2:3.10.3-5.el10_1.6*
Red Hat Enterprise Linux 10RedHatfreerdp-2:3.10.3-12.el10_2.2*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHatfreerdp-2:3.10.3-3.el10_0.6*
Red Hat Enterprise Linux 8RedHatfreerdp-2:2.11.7-7.el8_10*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatfreerdp-2:2.0.0-46.rc4.el8_2.11*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatfreerdp-2:2.2.0-13.el8_4*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatfreerdp-2:2.2.0-13.el8_4*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatfreerdp-2:2.2.0-7.el8_6.6*
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRedHatfreerdp-2:2.2.0-7.el8_6.6*
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRedHatfreerdp-2:2.2.0-7.el8_6.6*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatfreerdp-2:2.2.0-12.el8_8.6*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatfreerdp-2:2.2.0-12.el8_8.6*
Red Hat Enterprise Linux 9RedHatfreerdp-2:2.11.7-7.el9_8.1*
Red Hat Enterprise Linux 9RedHatfreerdp-2:2.11.7-1.el9_7.6*
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRedHatfreerdp-2:2.4.1-3.el9_0.5*
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRedHatfreerdp-2:2.4.1-6.el9_2.7*
Red Hat Enterprise Linux 9.4 Extended Update SupportRedHatfreerdp-2:2.11.2-1.el9_4.6*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHatfreerdp-2:2.11.7-1.el9_6.8*
FreerdpUbuntuesm-infra/xenial*
Freerdp3Ubuntunoble*
Freerdp3Ubuntuquesting*
Freerdp3Ubuntuupstream*

Potential Mitigations

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
  • Use libraries or frameworks that make it easier to handle numbers without unexpected consequences.
  • Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
  • Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
  • Use unsigned integers where possible. This makes it easier to perform validation for integer overflows. When signed integers are required, ensure that the range check includes minimum values as well as maximum values.
  • Understand the programming language’s underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, “not-a-number” calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7]
  • Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.

References

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