Vulnerability-Lookup

OESA-2026-3534 (CVE-2025-24294)

Vulnerability from osv_openeuler – Published: 2026-08-30 04:15 – Updated: 2026-08-30 04:15 – Source website

Summary

ruby security update

Details

Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl).

Security Fix(es):

The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.

An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.

This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.(CVE-2025-24294)

zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.(CVE-2026-27820)

Severity

9.8 (Critical)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2025-24294	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-27820	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "ruby-3.2.2-157.oe2403sp1.aarch64.rpm",
          "ruby-bundled-gems-3.2.2-157.oe2403sp1.aarch64.rpm",
          "ruby-debuginfo-3.2.2-157.oe2403sp1.aarch64.rpm",
          "ruby-debugsource-3.2.2-157.oe2403sp1.aarch64.rpm",
          "ruby-devel-3.2.2-157.oe2403sp1.aarch64.rpm",
          "rubygem-bigdecimal-3.1.3-157.oe2403sp1.aarch64.rpm",
          "rubygem-io-console-0.6.0-157.oe2403sp1.aarch64.rpm",
          "rubygem-json-2.6.3-157.oe2403sp1.aarch64.rpm",
          "rubygem-openssl-3.1.0-157.oe2403sp1.aarch64.rpm",
          "rubygem-psych-5.0.1-157.oe2403sp1.aarch64.rpm",
          "rubygem-rbs-2.8.2-157.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "ruby-help-3.2.2-157.oe2403sp1.noarch.rpm",
          "ruby-irb-3.2.2-157.oe2403sp1.noarch.rpm",
          "rubygem-did_you_mean-1.6.3-157.oe2403sp1.noarch.rpm",
          "rubygem-minitest-5.16.3-157.oe2403sp1.noarch.rpm",
          "rubygem-rake-13.0.6-157.oe2403sp1.noarch.rpm",
          "rubygem-rdoc-6.5.0-157.oe2403sp1.noarch.rpm",
          "rubygem-rexml-3.2.5-157.oe2403sp1.noarch.rpm",
          "rubygem-rss-0.2.9-157.oe2403sp1.noarch.rpm",
          "rubygem-test-unit-3.5.7-157.oe2403sp1.noarch.rpm",
          "rubygem-typeprof-0.21.3-157.oe2403sp1.noarch.rpm",
          "rubygems-3.4.10-157.oe2403sp1.noarch.rpm",
          "rubygems-devel-3.4.10-157.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "ruby-3.2.2-157.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "ruby-3.2.2-157.oe2403sp1.x86_64.rpm",
          "ruby-bundled-gems-3.2.2-157.oe2403sp1.x86_64.rpm",
          "ruby-debuginfo-3.2.2-157.oe2403sp1.x86_64.rpm",
          "ruby-debugsource-3.2.2-157.oe2403sp1.x86_64.rpm",
          "ruby-devel-3.2.2-157.oe2403sp1.x86_64.rpm",
          "rubygem-bigdecimal-3.1.3-157.oe2403sp1.x86_64.rpm",
          "rubygem-io-console-0.6.0-157.oe2403sp1.x86_64.rpm",
          "rubygem-json-2.6.3-157.oe2403sp1.x86_64.rpm",
          "rubygem-openssl-3.1.0-157.oe2403sp1.x86_64.rpm",
          "rubygem-psych-5.0.1-157.oe2403sp1.x86_64.rpm",
          "rubygem-rbs-2.8.2-157.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "ruby",
        "purl": "pkg:rpm/openEuler/ruby\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.2.2-157.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Critical"
  },
  "details": "Ruby is a fast and easy interpreted scripting language for object-oriented programming. It has many functions for processing text Files and perform system management tasks (such as Perl).\r\n\r\nSecurity Fix(es):\n\nThe attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.\n\nAn attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.\n\nThis resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.(CVE-2025-24294)\n\nzlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstream_buffer_ungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.(CVE-2026-27820)",
  "id": "OESA-2026-3534",
  "modified": "2026-08-30T04:15:20Z",
  "published": "2026-08-30T04:15:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3534"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-24294"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27820"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ruby security update",
  "upstream": [
    "CVE-2025-24294",
    "CVE-2026-27820"
  ]
}

CVE-2025-24294 (GCVE-0-2025-24294)

Vulnerability from cvelistv5 – Published: 2025-07-12 03:30 – Updated: 2025-07-16 13:37

Summary

The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet. An attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name. This resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-07-15 13:48 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

hackerone mitre root Scorecard

References

1 reference

URL	Tags
https://www.ruby-lang.org/en/news/2025/07/08/dos-…

Impacted products

1 product

Vendor	Product	Version
Ruby	resolv	Affected: 0.2 , ≤ 0.2.2 (custom) Affected: 0.3.0 , ≤ 0.3.0 (custom) Affected: 0.6 , ≤ 0.6.1 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "dateUpdated": "2025-07-16T13:37:43.395Z",
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          "shortName": "CISA-ADP"
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        "references": [
          {
            "tags": [
              "vendor-advisory"
            ],
            "url": "https://www.ruby-lang.org/en/news/2025/07/08/dos-resolv-cve-2025-24294/"
          }
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      }
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          "product": "resolv",
          "vendor": "Ruby",
          "versions": [
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            {
              "lessThanOrEqual": "0.6.1",
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      "descriptions": [
        {
          "lang": "en",
          "value": "The attack vector is a potential Denial of Service (DoS). The vulnerability is caused by an insufficient check on the length of a decompressed domain name within a DNS packet.\r\n\r\nAn attacker can craft a malicious DNS packet containing a highly compressed domain name. When the resolv library parses such a packet, the name decompression process consumes a large amount of CPU resources, as the library does not limit the resulting length of the name.\r\n\r\nThis resource consumption can cause the application thread to become unresponsive, resulting in a Denial of Service condition."
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      "providerMetadata": {
        "dateUpdated": "2025-07-12T03:30:40.226Z",
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    "datePublished": "2025-07-12T03:30:40.226Z",
    "dateReserved": "2025-01-17T01:00:07.458Z",
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    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1"
}

CVE-2026-27820 (GCVE-0-2026-27820)

Vulnerability from cvelistv5 – Published: 2026-04-16 17:27 – Updated: 2026-04-16 18:20

Title

zlib: Buffer Overflow in Zlib::GzipReader ungetc via large input leads to memory corruption

Summary

Severity

1.7 (Low)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-16 18:20 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-131 - Incorrect Calculation of Buffer Size

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/ruby/zlib/security/advisories/…	x_refsource_CONFIRM
https://hackerone.com/reports/3467067	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
ruby	zlib	Affected: < 3.0.1 Affected: >= 3.1.0, < 3.1.2 Affected: >= 3.2.0, < 3.2.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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        "metrics": [
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                "id": "CVE-2026-27820",
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                "role": "CISA Coordinator",
                "timestamp": "2026-04-16T18:20:13.051389Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-3534 (CVE-2025-24294)

CVE-2025-24294 (GCVE-0-2025-24294)

CVE-2026-27820 (GCVE-0-2026-27820)

Tags

Sightings

Nomenclature

Related by attack behaviour