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CVE-2026-46385 (GCVE-0-2026-46385)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:58 – Updated: 2026-09-07 12:05
VLAI
Title
iskorotkov/avro: CPU Exhaustion in Avro Decoder
Summary
iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, the Avro array and map decoders looped over an attacker-controlled block-count value without checking the underlying reader's error state inside the loop body. Reader.ReadBlockHeader returns the count as a Go int, which is 64-bit on amd64 / arm64 targets — so a producer can declare a block of up to math.MaxInt64 (~9.2 × 10¹⁸) elements followed by EOF (or any truncated payload), and the decoder will attempt that many no-op iterations before propagating the error. The realistic ceiling is "indefinite until the worker is killed externally" — a single hostile payload pins a CPU core until the process is OOM-killed, deadline-cancelled, or terminated. Remote, unauthenticated denial-of-service. This vulnerability is fixed in 2.33.0.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-01 16:22 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
URL Tags
https://github.com/iskorotkov/avro/security/advis… x_refsource_CONFIRM
https://access.redhat.com/security/cve/CVE-2026-46385 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2483475 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:48151 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41030 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:44622 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47149 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:53530 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41064 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30651 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57191 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:60386 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:42852 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
iskorotkov avro Affected: < 2.33.0
guessed Create a notification for this product.
Red Hat Cryostat 4 on RHEL 9 Unaffected: 4.2.0-19 , < * (rpm)
    cpe:/a:redhat:cryostat:4::el9
Create a notification for this product.
Red Hat Multicluster Global Hub 1.4.5 Unaffected: 1784060681 , < * (rpm)
    cpe:/a:redhat:multicluster_globalhub:1.4::el9
Create a notification for this product.
Red Hat Multicluster Global Hub 1.6.5 Unaffected: 1784561376 , < * (rpm)
    cpe:/a:redhat:multicluster_globalhub:1.6::el9
Create a notification for this product.
Red Hat Multicluster Global Hub 1.7.0 Unaffected: 1784906628 , < * (rpm)
Unaffected: 1785442872 , < * (rpm)
    cpe:/a:redhat:multicluster_globalhub:1.7::el9
Create a notification for this product.
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 Unaffected: 1783578847 , < * (rpm)
    cpe:/a:redhat:acm:2.11::el9
Create a notification for this product.
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 Unaffected: 1782383730 , < * (rpm)
    cpe:/a:redhat:acm:2.13::el9
Create a notification for this product.
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 Unaffected: 1786908968 , < * (rpm)
    cpe:/a:redhat:acm:2.16::el9
Create a notification for this product.
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 Unaffected: 1787316467 , < * (rpm)
    cpe:/a:redhat:acm:2.17::el9
Create a notification for this product.
Red Hat Red Hat multicluster global hub 1.5.1 Unaffected: 1784562060 , < * (rpm)
    cpe:/a:redhat:multicluster_globalhub:1.5::el9
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
Create a notification for this product.
Show details on NVD website
To clipboard 

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A remote unauthenticated attacker could exploit this issue using specially crafted Avro payloads causing denial of service, where the affected system\u0027s CPU is consumed indefinitely until the process is terminated.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-835\", \"description\": \"Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-09-07T12:05:12.929Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-46385\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-01T16:22:43.598595Z\"}}}], \"references\": [{\"url\": \"https://github.com/iskorotkov/avro/security/advisories/GHSA-w8j3-pq8g-8m7w\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-01T16:14:40.611Z\"}}], \"cna\": {\"title\": \"iskorotkov/avro: CPU Exhaustion in Avro Decoder\", \"source\": {\"advisory\": \"GHSA-w8j3-pq8g-8m7w\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.7, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"iskorotkov\", \"product\": \"avro\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 2.33.0\"}]}], \"references\": [{\"url\": \"https://github.com/iskorotkov/avro/security/advisories/GHSA-w8j3-pq8g-8m7w\", \"name\": \"https://github.com/iskorotkov/avro/security/advisories/GHSA-w8j3-pq8g-8m7w\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"iskorotkov/avro is a fast Go Avro codec. Prior to 2.33.0, the Avro array and map decoders looped over an attacker-controlled block-count value without checking the underlying reader\u0027s error state inside the loop body. Reader.ReadBlockHeader returns the count as a Go int, which is 64-bit on amd64 / arm64 targets \\u2014 so a producer can declare a block of up to math.MaxInt64 (~9.2 \\u00d7 10\\u00b9\\u2078) elements followed by EOF (or any truncated payload), and the decoder will attempt that many no-op iterations before propagating the error. The realistic ceiling is \\\"indefinite until the worker is killed externally\\\" \\u2014 a single hostile payload pins a CPU core until the process is OOM-killed, deadline-cancelled, or terminated. Remote, unauthenticated denial-of-service. This vulnerability is fixed in 2.33.0.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400: Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-05-29T19:58:59.667Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-46385\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-07T12:05:12.929Z\", \"dateReserved\": \"2026-05-13T19:53:47.922Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-05-29T19:58:59.667Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.