Каталог CVE

CVE-2026-54904

concurrent-ruby is a modern concurrency tools for…

concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::AtomicReference#update can enter a permanent busy retry loop when the current value is Float::NAN. The issue is caused by the interaction between AtomicReference#update, which retries until compare_and_set(old_value, new_value) succeeds; Numeric compare_and_set, which checks old == old_value before attempting the underlying atomic swap.; and Ruby NaN semantics, where Float::NAN == Float::NAN is always false. As a result, once an AtomicReference contains Float::NAN, calling #update repeatedly evaluates the caller's block and never returns. In services that store externally derived numeric values in an AtomicReference, this can cause CPU exhaustion or permanent request/job hangs. This vulnerability is fixed in 1.3.7.

Критичність: High · CVSS 8.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Jun 23, 2026, 2:19:46 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.67% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiansid	ruby-concurrent	`1.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2026-54904]
Debiansid	ruby-concurrent	`1.3.8-1`	Fixed	[CVE-2026-54904]
Debianforky	ruby-concurrent	`1.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2026-54904]
Debianforky	ruby-concurrent	`1.3.8-1`	Fixed	[CVE-2026-54904]

Showing 4 fix observations. All 10 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	concurrent_ruby	`1.3.7`	UnknownSource applicability is not established	Provider not reported
UnknownRelease not reported	ruby-concurrent	Not reported	UnknownSource applicability is not established	Provider not reported
Debianbookworm	ruby-concurrent	Not reported	AffectedDistribution reports no fix	[CVE-2026-54904]
Debianbookworm	ruby-concurrent	`1.1.6+dfsg-5`	Affected	[CVE-2026-54904]
Debianforky	ruby-concurrent	`1.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2026-54904]
Debianforky	ruby-concurrent	`1.3.8-1`	Fixed	[CVE-2026-54904]
Debiansid	ruby-concurrent	`1.3.7-1`	FixedDistribution-reported fixed boundary	[CVE-2026-54904]
Debiansid	ruby-concurrent	`1.3.8-1`	Fixed	[CVE-2026-54904]
Debiantrixie	ruby-concurrent	Not reported	AffectedDistribution reports no fix	[CVE-2026-54904]
Debiantrixie	ruby-concurrent	`1.3.5-1`	Affected	[CVE-2026-54904]

Original provider fields

{
  "package_releases": [
    {
      "name": "ruby-concurrent",
      "status": "fixed",
      "release": "sid",
      "version": "1.3.8-1"
    },
    {
      "name": "ruby-concurrent",
      "status": "fixed",
      "release": "forky",
      "version": "1.3.8-1"
    },
    {
      "name": "ruby-concurrent",
      "status": "vulnerable",
      "release": "trixie",
      "version": "1.3.5-1"
    },
    {
      "name": "ruby-concurrent",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.1.6+dfsg-5"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "ruby-concurrent",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1.3.7-1"
    },
    {
      "bug": null,
      "name": "ruby-concurrent",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1.3.7-1"
    },
    {
      "bug": null,
      "name": "ruby-concurrent",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "ruby-concurrent",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "ruby-concurrent",
      "fixed_version": "not yet fixed",
      "applicability_unknown": true
    },
    {
      "name": "concurrent_ruby",
      "fixed_version": "1.3.7",
      "applicability_unknown": true
    },
    {
      "name": "concurrent_ruby",
      "ranges": [
        {
          "fixed": "1.3.7",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54904",
      "fixed_version": "1.3.7",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2026-54904",
      "provider_updated_at": "2026-10-25T22:10:00.150"
    }
  ]
}

Publisher notes

[trixie] ruby-concurrent: Minor issue [bookworm] ruby-concurrent: Minor issue; requires an application to store Float::NAN in a Concurrent::AtomicReference and then call #update on it

OpenFactory catalog packages

Зіставлення пакетів триває.

[Debian 12 (Bookworm)]

[ruby-concurrent]Невідомо
Подробиці (2)
- 1.1.6+dfsg-5 · all · bookworm
  Уражена
  nvd · ruby-concurrent · debian · bookworm; nvd · ruby-concurrent · debian · 12
- 1.1.6+dfsg-5 · all · bookworm
  Уражена
  nvd · ruby-concurrent · debian · bookworm; nvd · ruby-concurrent · debian · 12
[ruby-concurrent-ext]Невідомо
Пакет джерела: [ruby-concurrent]
Подробиці (2)
- 1.1.6+dfsg-5+b2 · amd64 · bookworm
  Уражена
  nvd · ruby-concurrent · debian · bookworm; nvd · ruby-concurrent · debian · 12
- 1.1.6+dfsg-5+b2 · arm64 · bookworm
  Уражена
  nvd · ruby-concurrent · debian · bookworm; nvd · ruby-concurrent · debian · 12

[Debian 13 (Trixie)]

[ruby-concurrent]Невідомо
Подробиці (2)
- 1.3.5-1 · all · trixie
  Уражена
  nvd · ruby-concurrent · debian · 13
- 1.3.5-1 · all · trixie
  Уражена
  nvd · ruby-concurrent · debian · 13
[ruby-concurrent-ext]Невідомо
Пакет джерела: [ruby-concurrent]
Подробиці (2)
- 1.3.5-1 · amd64 · trixie
  Уражена
  nvd · ruby-concurrent · debian · 13
- 1.3.5-1 · arm64 · trixie
  Уражена
  nvd · ruby-concurrent · debian · 13

Спостережено: Oct 26, 2026, 2:09:35 AM UTC

Посилання

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]