CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-42154
High (7.5) in prometheus prometheus. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in github.com/prometheus/prometheus 0.305.2, 0.311.3.
Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process. This issue has been patched in versions 3.5.3 and 3.11.3.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-400, CWE-789, CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Affected
- prometheus:prometheus
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-8rm2-7qqf-34qm | Go | github.com/prometheus/prometheus | >=0.306.0 <0.311.3 | 0.311.3 |
| GHSA-8rm2-7qqf-34qm | Go | github.com/prometheus/prometheus | <0.305.2 | 0.305.2 |
| GHSA-8rm2-7qqf-34qm | Go | github.com/prometheus/prometheus | >=1.0.0-rc.0 <=2.5.0 | no fix published |
| GO-2026-5264 | Go | github.com/prometheus/prometheus | <0.305.2 >=0.306.0 <0.311.3 >=1.0.0-rc.0 | 0.305.2, 0.311.3 |
| GO-2026-5264 | Go | github.com/prometheus/prometheus/v2 | all versions | no fix published |
References
- https://github.com/prometheus/prometheus/pull/18584
- https://github.com/prometheus/prometheus/pull/18585
- https://github.com/prometheus/prometheus/releases/tag/v3.11.3
- https://github.com/prometheus/prometheus/releases/tag/v3.5.3
- https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm