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CVE Vulnerabilities

CVE-2026-11774

Integer Overflow or Wraparound

Published: Jun 11, 2026 | Modified: Jul 09, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.6 IMPORTANT
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-11774
CWEhttps://cwe.mitre.org/data/definitions/190.html

An integer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), adding sizeof(uint32_t) to a crafted SASL packet length prefix of 0xFFFFFFFC causes unsigned wraparound to zero, bypassing the nsslapd-maxsasliosize limit and leading to a heap buffer overflow of up to approximately 2 megabytes of attacker-controlled data. After a successful SASL bind with integrity protection (SSF > 0), a remote attacker can cause a Denial of Service (DoS) or achieve Remote Code Execution (RCE). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, enrolled host, or service account can trigger this vulnerability over the network. This flaw is independent of CVE-2025-14905, which patched schema.c only and did not modify sasl_io.c.

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
Red Hat Directory Server 11.5 E4S for RHEL 8RedHatredhat-ds:11-8060020260702180044.0ca98e7e*
Red Hat Directory Server 11.7 E4S for RHEL 8RedHatredhat-ds:11-8080020260702180836.f969626e*
Red Hat Directory Server 11.9 for RHEL 8RedHatredhat-ds:11-8100020260702145313.37ed7c03*
Red Hat Directory Server 12.2 E4S for RHEL 9RedHatredhat-ds:12-9020020260703060155.1674d574*
Red Hat Directory Server 12.4 E4S for RHEL 9RedHatredhat-ds:12-9040020260703055735.1674d574*
Red Hat Enterprise Linux 10RedHat389-ds-base-0:3.2.0-8.el10_2*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHat389-ds-base-0:3.0.6-19.el10_0*
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHat389-ds-base-0:1.3.11.1-13.el7_9*
Red Hat Enterprise Linux 8RedHat389-ds:1.4-8100020260626120929.25e700aa*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHat389-ds:1.4-8040020260629123121.96015a92*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHat389-ds:1.4-8040020260629123121.96015a92*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHat389-ds:1.4-8060020260626130540.824efc52*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHat389-ds:1.4-8060020260626130540.824efc52*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHat389-ds:1.4-8080020260630025241.6dbb3803*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHat389-ds:1.4-8080020260630025241.6dbb3803*
Red Hat Enterprise Linux 9RedHat389-ds-base-0:2.8.0-8.el9_8*
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRedHat389-ds-base-0:2.2.4-19.el9_2*
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRedHat389-ds-base-0:2.4.5-26.el9_4*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHat389-ds-base-0:2.6.1-22.el9_6*
Red Hat Directory Server 13.2RedHatdirsrv/dirsrv-container-rhel10:1783452100*
389-ds-baseUbuntuquesting*

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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