CVE-2026-54905 Vulnerability Analysis & Exploit Details

CVE-2026-54905
Vulnerability Scoring

5.5
/10
Significant Risk

Security assessments indicate that CVE-2026-54905 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-54905 Details

Status: Analyzed

Last updated: 🕗 26 Jun 2026, 20:01 UTC
Originally published on: 🕔 24 Jun 2026, 17:17 UTC

Time between publication and last update: 2 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVE-2026-54905 Vulnerability Summary

CVE-2026-54905: concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReentrantReadWriteLock can incorrectly grant a write lock after one thread acquires the read lock 32,768 times. The lock stores a thread's local read and write hold counts in one integer. The low 15 bits are used for the read hold count, and bit 15 is used as WRITE_LOCK_HELD. After 32,768 reentrant read acquisitions, the local read count crosses into the write-lock bit. try_write_lock then treats the thread as already holding a write lock and returns true without setting the global RUNNING_WRITER bit. This breaks the core mutual-exclusion guarantee: the caller is told it has a write lock, but other threads can still hold or acquire read locks at the same time. This vulnerability is fixed in 1.3.7.

Assessing the Risk of CVE-2026-54905

Access Complexity Graph

The exploitability of CVE-2026-54905 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-54905

CVE-2026-54905 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-54905, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-54905, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-54905 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: None
    CVE-2026-54905 poses no threat to data integrity.
  • Availability: None
    CVE-2026-54905 does not impact system availability.

CVE-2026-54905 References

External References

CWE Common Weakness Enumeration

CWE-128

CAPEC Common Attack Pattern Enumeration and Classification

  • Forced Integer Overflow CAPEC-92 This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.

Vulnerable Configurations

  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.0.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.0.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.0.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.0.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.0:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.0:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre3:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre3:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre4:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre4:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre5:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.1.1:pre5:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.0:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.0:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.2.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.0:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.0:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.0:pre3:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.0:pre3:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.1:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.1:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.1:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.1:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.1:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.1:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.3.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.4.0:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.4.0:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.4.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.4.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.5.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.5.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.5.0:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.5.0:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.0:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.0:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.0:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.0:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.6.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc0:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc0:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc3:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.0:rc3:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.7.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:pre3:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.8.0:pre3:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:pre3:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.0:pre3:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:0.9.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:pre4:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:pre4:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:pre5:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.0:pre5:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:pre3:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.3:pre3:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.4:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.4:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.5:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.0.5:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.0:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.0:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.0:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.0:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.0:pre2:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.0:pre2:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.3:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.3:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.4:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.4:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.5:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.5:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.6:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.6:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.6:pre1:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.6:pre1:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.7:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.7:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.8:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.8:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.9:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.9:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.10:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.1.10:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.0:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.0:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.1:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.1:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.3:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.2.3:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.0:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.0:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.1:-:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.1:-:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.1:pre:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.1:pre:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.2:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.2:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.3:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.3:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.4:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.4:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.5:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.5:*:*:*:*:ruby:*:*
  • cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.6:*:*:*:*:ruby:*:*
    cpe:2.3:a:rubyconcurrency:concurrent_ruby:1.3.6:*:*:*:*:ruby:*:*

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