TI-2023-19083 Aliases CVE-2023-37475 GHSA-9x44-9pgq-cf45

Attacker-controlled parameter can cause denial of service in hamba avro

HIGH 72CWE-400Published 2023-07-17 · Updated 2024-10-18

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

Hamba avro is a go lang encoder/decoder implementation of the avro codec specification. In affected versions a well-crafted string passed to avro's `github.com/hamba/avro/v2.Unmarshal()` can throw a `fatal error: runtime: out of memory` which is unrecoverable and can cause denial of service of the consumer of avro. The root cause of the issue is that avro uses part of the input to `Unmarshal()` to determine the size when creating a new slice and hence an attacker may consume arbitrary amounts of memory which in turn may cause the application to crash. This issue has been addressed in commit `b4a402f4` which has been included in release version `2.13.0`. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00953 61st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed avro (hamba): 2.13.0github.com/hamba/avro (Go): 2.13.0+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
hamba	avro	before 2.13.0	2.13.0	Patch available	CNA
—	github.com/hamba/avro (Go)	before 2.13.0	2.13.0	Patch available	GHSA-9x44-9pgq-cf45
—	github.com/hamba/avro/v2 (Go)	before 2.13.0	2.13.0	Patch available	GHSA-9x44-9pgq-cf45

avro Vendorhamba Affected before 2.13.0 Fixed in 2.13.0 Patch available CNA
github.com/hamba/avro (Go) Vendor— Affected before 2.13.0 Fixed in 2.13.0 Patch available GHSA-9x44-9pgq-cf45
github.com/hamba/avro/v2 (Go) Vendor— Affected before 2.13.0 Fixed in 2.13.0 Patch available GHSA-9x44-9pgq-cf45

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:avro_project:avro::::::go::*	before 2.13.0	Vulnerable	Avro Project

cpe:2.3:a:avro_project:avro:*:*:*:*:*:go:*:* Versions before 2.13.0 Vulnerable ·Avro Project

Remediation

Fix · CNA avro (hamba) Fixed in 2.13.0
Fix · GHSA-9x44-9pgq-cf45 github.com/hamba/avro (Go) Fixed in 2.13.0 Advisory →
Fix · GHSA-9x44-9pgq-cf45 github.com/hamba/avro/v2 (Go) Fixed in 2.13.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2023-37475
2026-10-03 Alias added: GHSA-9x44-9pgq-cf45

References

Other 4

Sources

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