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CVE-2026-42154 is a denial-of-service vulnerability in Prometheus affecting the remote read endpoint at /api/v1/read. In vulnerable versions prior to 3.5.3 and 3.11.3, Prometheus does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An attacker can submit a small crafted snappy payload that advertises an excessively large decoded size, causing Prometheus to perform very large heap allocations during request processing. Repeated or concurrent exploitation can exhaust available memory and terminate the Prometheus process.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.