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CVE-2021-26291 is an origin-validation flaw in Apache Maven's legacy dependency-resolution behavior. Maven follows repository definitions declared in a dependency's Project Object Model (POM), potentially causing a build to retrieve artifacts from an unanticipated repository. An attacker that compromises, impersonates, or intercepts such a referenced repository can substitute malicious artifacts, creating a software supply-chain compromise risk. Apache Maven 3.8.1 and later no longer follow non-SSL HTTP repository references by default.
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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.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical network-accessible vulnerability referenced by an Alma Linux 9.2 local security-check plugin. The supplied CVSS v3 vector indicates no authentication or user interaction is required and high confidentiality and integrity impact; the content states exploits are available.
Apache Maven security issue addressed by blocking HTTP repositories by default.
Maven security issue addressed by blocking HTTP-based repositories by default.
Maven security issue addressed by blocking repositories using HTTP by default.
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.