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CVE-2021-27918 is an infinite-loop vulnerability in Go's standard-library encoding/xml package. In Go releases before 1.15.9 and 1.16.x before 1.16.1, the Decode, DecodeElement, and Skip methods can fail to terminate when xml.NewTokenDecoder is initialized with a custom TokenReader that returns EOF in the middle of an XML element.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Go encoding/xml flaw that can cause an infinite loop when xml.NewTokenDecoder is used with a custom TokenReader.
A prior Serverless vulnerability whose remediation was incomplete, prompting the CVE-2021-3703 fix.
A Go encoding/xml vulnerability in which xml.NewTokenDecoder can enter an infinite loop when supplied a custom TokenReader.
An infinite-loop denial-of-service vulnerability in Go's encoding/xml package when xml.NewTokenDecoder is used with a custom TokenReader.
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.