CVE-2026-46385 (GCVE-0-2026-46385)
Vulnerability from cvelistv5 – Published: 2026-05-29 19:58 – Updated: 2026-09-09 12:05
VLAI
EPSS
VEX
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
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-01 16:22 UTC
CWE
Assigner
References
14 references
Impacted products
14 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| iskorotkov | avro |
Affected:
< 2.33.0
|
guessed | |
| Red Hat | Cryostat 4 on RHEL 9 |
Unaffected:
4.2.0-19 , < *
(rpm)
cpe:/a:redhat:cryostat:4::el9 |
||
| Red Hat | Multicluster Global Hub 1.4.5 |
Unaffected:
1784060681 , < *
(rpm)
cpe:/a:redhat:multicluster_globalhub:1.4::el9 |
||
| Red Hat | Multicluster Global Hub 1.6.5 |
Unaffected:
1784561376 , < *
(rpm)
cpe:/a:redhat:multicluster_globalhub:1.6::el9 |
||
| Red Hat | Multicluster Global Hub 1.7.0 |
Unaffected:
1784906628 , < *
(rpm)
Unaffected: 1785442872 , < * (rpm) cpe:/a:redhat:multicluster_globalhub:1.7::el9 |
||
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.11 |
Unaffected:
1783578847 , < *
(rpm)
cpe:/a:redhat:acm:2.11::el9 |
||
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.13 |
Unaffected:
1782383730 , < *
(rpm)
cpe:/a:redhat:acm:2.13::el9 |
||
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.16 |
Unaffected:
1786908968 , < *
(rpm)
cpe:/a:redhat:acm:2.16::el9 |
||
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 |
Unaffected:
1787316467 , < *
(rpm)
cpe:/a:redhat:acm:2.17::el9 |
||
| Red Hat | Red Hat multicluster global hub 1.5.3 |
Unaffected:
1784562060 , < *
(rpm)
cpe:/a:redhat:multicluster_globalhub:1.5::el9 |
||
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
||
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
||
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
||
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
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"value": "RHSA-2026:60386: Red Hat Advanced Cluster Management for Kubernetes 2.17"
},
{
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"value": "RHSA-2026:42852: Red Hat multicluster global hub 1.5.1"
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"timeline": [
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"title": "github.com/hamba/avro/v2: github.com/linkedin/goavro/v2: CPU Exhaustion in Avro Decoder via Unbounded Block-Count Iteration",
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Solutions
ADP · redhat-SADP
RHSA-2026:48151: Cryostat 4 on RHEL 9
RHSA-2026:41030: Multicluster Global Hub 1.4.5
RHSA-2026:44622: Multicluster Global Hub 1.6.5
RHSA-2026:47149: Multicluster Global Hub 1.7.0
RHSA-2026:53530: Multicluster Global Hub 1.7.0
RHSA-2026:41064: Red Hat Advanced Cluster Management for Kubernetes 2.11
RHSA-2026:30651: Red Hat Advanced Cluster Management for Kubernetes 2.13
RHSA-2026:57191: Red Hat Advanced Cluster Management for Kubernetes 2.16
RHSA-2026:60386: Red Hat Advanced Cluster Management for Kubernetes 2.17
RHSA-2026:42852: Red Hat multicluster global hub 1.5.3
Workarounds
ADP · redhat-SADP
Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when they become available.
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
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.
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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.