Vulnerability-Lookup

FKIE_CVE-2020-36846

Vulnerability from fkie_nvd - Published: 2025-05-30 01:15 - Updated: 2026-06-17 03:16

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

A buffer overflow, as described in CVE-2020-8927, exists in the embedded Brotli library. Versions of IO::Compress::Brotli prior to 0.007 included a version of the brotli library prior to version 1.0.8, where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your IO::Compress::Brotli module to 0.007 or later. If one cannot update, we recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.

References

	URL	Tags
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/advisories/GHSA-5v8v-66v8-mwm7
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/google/brotli/commit/223d80cfbec8fd346e32906c732c8ede21f0cea6
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/google/brotli/pull/826
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://github.com/timlegge/perl-IO-Compress-Brotli/blob/8b44c83b23bb4658179e1494af4b725a1bc476bc/Changes#L52
	9b29abf9-4ab0-4765-b253-1875cd9b441e	https://nvd.nist.gov/vuln/detail/CVE-2020-8927

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "IO-Compress-Brotli",
          "product": "IO::Compress::Brotli",
          "programFiles": [
            "brotli/c/dec/bit_reader.h"
          ],
          "repo": "https://github.com/timlegge/perl-IO-Compress-Brotli",
          "vendor": "TIMLEGGE",
          "versions": [
            {
              "lessThan": "0.007",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A buffer overflow, as described in CVE-2020-8927, exists in the embedded Brotli library.\u00a0 Versions of IO::Compress::Brotli prior to 0.007 included a version of the brotli library prior to version 1.0.8, where an attacker controlling the input length of a \"one-shot\" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your IO::Compress::Brotli module to 0.007\u00a0or later. If one cannot update, we recommend to use the \"streaming\" API as opposed to the \"one-shot\" API, and impose chunk size limits."
    },
    {
      "lang": "es",
      "value": "Existe un desbordamiento de b\u00fafer, como se describe en CVE-2020-8927, en la librer\u00eda Brotli integrada. Las versiones de IO::Compress::Brotli anteriores a la 0.007 inclu\u00edan una versi\u00f3n de la librer\u00eda Brotli anterior a la 1.0.8, donde un atacante que controle la longitud de entrada de una solicitud de descompresi\u00f3n \u00fanica a un script puede provocar un fallo, lo cual ocurre al copiar fragmentos de datos de m\u00e1s de 2 GiB. Se recomienda actualizar el m\u00f3dulo IO::Compress::Brotli a la versi\u00f3n 0.007 o posterior. Si no se puede actualizar, recomendamos usar la API de streaming en lugar de la API \u00fanica e imponer l\u00edmites de tama\u00f1o de fragmentos."
    }
  ],
  "id": "CVE-2020-36846",
  "lastModified": "2026-06-17T03:16:19.050",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-36846",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-05-30T14:40:47.592851Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-05-30T01:15:20.950",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/advisories/GHSA-5v8v-66v8-mwm7"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/google/brotli/commit/223d80cfbec8fd346e32906c732c8ede21f0cea6"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/google/brotli/pull/826"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://github.com/timlegge/perl-IO-Compress-Brotli/blob/8b44c83b23bb4658179e1494af4b725a1bc476bc/Changes#L52"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8927"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Deferred"
}

CVE-2020-36846 (GCVE-0-2020-36846)

Vulnerability from cvelistv5 – Published: 2025-05-30 00:50 – Updated: 2025-05-30 22:01

Title

IO::Compress::Brotli versions prior to 0.007 for Perl have an integer overflow in the bundled Brotli C library

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-30 14:40 UTC

CWE

CWE-1395 - Dependency on Vulnerable Third-Party Component

Assigner

CPANSec redhat root

References

5 references

URL	Tags
https://github.com/google/brotli/pull/826	issue-tracking
https://github.com/advisories/GHSA-5v8v-66v8-mwm7	third-party-advisory
https://github.com/timlegge/perl-IO-Compress-Brot…	mitigation
https://nvd.nist.gov/vuln/detail/CVE-2020-8927	vdb-entry
https://github.com/google/brotli/commit/223d80cfb…	patch

Impacted products

1 product

Vendor	Product	Version
TIMLEGGE	IO::Compress::Brotli	Affected: 0 , < 0.007 (custom)

Credits

Robert Rothenberg (RRWO)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2020-36846",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-05-30T14:40:47.592851Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-05-30T22:01:41.998Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "IO-Compress-Brotli",
          "product": "IO::Compress::Brotli",
          "programFiles": [
            "brotli/c/dec/bit_reader.h"
          ],
          "repo": "https://github.com/timlegge/perl-IO-Compress-Brotli",
          "vendor": "TIMLEGGE",
          "versions": [
            {
              "lessThan": "0.007",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Robert Rothenberg (RRWO)"
        }
      ],
      "descriptions": [
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            }
          ],
          "value": "A buffer overflow, as described in CVE-2020-8927, exists in the embedded Brotli library.\u00a0 Versions of IO::Compress::Brotli prior to 0.007 included a version of the brotli library prior to version 1.0.8, where an attacker controlling the input length of a \"one-shot\" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your IO::Compress::Brotli module to 0.007\u00a0or later. If one cannot update, we recommend to use the \"streaming\" API as opposed to the \"one-shot\" API, and impose chunk size limits."
        }
      ],
      "problemTypes": [
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          "descriptions": [
            {
              "cweId": "CWE-1395",
              "description": "CWE-1395 Dependency on Vulnerable Third-Party Component",
              "lang": "en",
              "type": "CWE"
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        "dateUpdated": "2025-05-30T00:50:28.582Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
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      "references": [
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          "tags": [
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          "url": "https://github.com/google/brotli/pull/826"
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          ],
          "url": "https://github.com/advisories/GHSA-5v8v-66v8-mwm7"
        },
        {
          "tags": [
            "mitigation"
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          "url": "https://github.com/timlegge/perl-IO-Compress-Brotli/blob/8b44c83b23bb4658179e1494af4b725a1bc476bc/Changes#L52"
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        {
          "tags": [
            "vdb-entry"
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-8927"
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        {
          "tags": [
            "patch"
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          "url": "https://github.com/google/brotli/commit/223d80cfbec8fd346e32906c732c8ede21f0cea6"
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      "source": {
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    "datePublished": "2025-05-30T00:50:28.582Z",
    "dateReserved": "2025-05-28T01:44:05.054Z",
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    "state": "PUBLISHED"
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  "dataVersion": "5.1"
}

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.

Detection rules are retrieved from Rulezet.

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.