Prometheus v3.11.3

v3.11.3

3.11.3 / 2026-04-27

Security 3
  • Fix OAuth client_secret being exposed in plaintext via /-/config endpoint in AzureAD remote write
  • Reject snappy-compressed requests in remote-read whose declared decoded length exceeds the decode limit
  • Fix stored XSS via unescaped le label values in old UI heatmap chart tick labels

From Prometheus

This release fixes mutiple security issues.

We would like to thank the following people for the responsible disclosures:

  • Shadowbyte (4c1dr3aper) - Charlie Lewis for the Remote-Read snappy decode vulnerability.

  • Brett Gervasoni for the AzureAD OAuth client_secret vulnerability.

  • @iiihaiii and @Ngocnn97 for the Old UI XSS vulnerability.

  • [SECURITY] AzureAD remote write: Fix OAuth client_secret being exposed in plaintext via /-/config endpoint. GHSA-wg65-39gg-5wfj / CVE-2026-42151 #18590

  • [SECURITY] Remote-read: Reject snappy-compressed requests whose declared decoded length exceeds the decode limit. GHSA-8rm2-7qqf-34qm / CVE-2026-42154 #18584

  • [SECURITY] UI: Fix stored XSS via unescaped le label values in old UI heatmap chart tick labels. GHSA-fw8g-cg8f-9j28 #18588

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