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CVE-2021-33196 is an uncontrolled resource-consumption vulnerability in the Go standard library archive/zip package. A pre-allocation optimization in zip.NewReader trusts the file-count value declared in a ZIP archive header. A crafted malformed archive declaring a significant number of files can cause zip.NewReader, and consequently OpenReader, to panic or attempt excessive memory allocation.
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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 public exploits tracked yet. Mallory keeps watching.
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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously addressed Go archive/zip vulnerability referenced because its fix was incomplete; the advisory addresses the incomplete fix under CVE-2021-39293.
A Go archive/zip flaw where a malformed archive may trigger a panic or memory exhaustion, creating a denial-of-service risk.
A Go archive/zip flaw whereby a malformed archive can cause a panic or memory exhaustion.
A Go archive/zip flaw in which a malformed archive can cause a panic or memory exhaustion.
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.