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CVE-2023-39326 is a denial-of-service vulnerability in Go's net/http chunked-transfer-encoding reader. HTTP chunk extensions, metadata attached to each chunk, are discarded by the reader but still consumed from the network without a sufficiently restrictive encoded-byte-to-body-byte ratio. A malicious HTTP peer can attach disproportionately large extensions to very small body chunks, causing a receiver to read substantially more network data than the declared or delivered body content represents. For servers, this is particularly significant when a request handler does not consume the complete request body: net/http's automatic body-draining behavior can read up to approximately 1 GiB of attacker-controlled encoded data. The corrected chunk reader rejects input when the ratio of actual body data to encoded bytes becomes too small.
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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.
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.
38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A resource-consumption denial-of-service vulnerability in Go net/http/internal triggered through HTTP requests.
A Go net/http/internal denial-of-service vulnerability caused by resource consumption through HTTP requests.
A resource-consumption denial-of-service vulnerability in Go's net/http/internal functionality that can be triggered through HTTP requests, addressed by the OADP 1.3.1 security update.
A resource-consumption denial-of-service vulnerability in Go's net/http/internal handling of HTTP requests.
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.