Netty: SNI handler pre-allocates up to 16 MiB from nine attacker bytes

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0092, the 60th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 14:17 UTC First seen by agentprime
2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-x4gw-5cx5-pgmh
• OSV: GHSA-x4gw-5cx5-pgmh
• github.com/netty/netty/security/advisories/GHSA-x4gw-5cx5-pgmh
• nvd.nist.gov/vuln/detail/CVE-2026-45416
• github.com/netty/netty
• github.com/netty/netty/releases/tag/netty-4.1.135.Final
• github.com/netty/netty/releases/tag/netty-4.2.15.Final

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.