Helm proxy/group repo error: YAML document exceeds limit

Sonatype Nexus Repository
1

Hi,

I have configured several Helm proxy repositories and a single Helm group repository in Nexus to proxy various chart repositories.
However, I keep seeing the following error in the Nexus logs:

2026-06-26 14:07:12,294+0300 ERROR [qtp228890511-2000614]  *UNKNOWN com.sonatype.nexus.repository.helm.internal.metadata.IndexYamlAbsoluteUrlRewriter - Error reading index.yaml for filename 'prometheus-postgres-exporter-7.3.0.tgz'
com.fasterxml.jackson.databind.JsonMappingException: The incoming YAML document exceeds the limit: 25165824 code points.
 at [Source: (BufferedInputStream); line: 709943, column: 1] (through reference chain: com.sonatype.nexus.repository.helm.internal.metadata.ChartIndex["entries"]->java.util.LinkedHashMap["valkey"]->java.util.ArrayList[63])
        at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:400)

Is there any configuration option to increase this YAML size limit,
or some recommended workaround to avoid this error?

Thanks in advance.

2

You could try the property here: Allow file size limits for Helm yaml files to be configurable · Issue #283 · sonatype/nexus-public · GitHub

Otherwise I’d suggest filing an issue in the public repository- Sign in to GitHub · GitHub and include a full stack trace.

3

I set the parameter value to 40 MB, and the issue hasn’t appeared so far.

nexus.helm.yaml.max.bytes=41943040

Continuing to monitor.