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CVE

CVE-2026-79787

Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature
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CVE

CVE-2026-79787

Alluxio through 2.9.5 S3 REST Proxy Authentication Bypass via Unverified Request Signature

Alluxio's S3 REST proxy fails to verify AWS Signature Version 4 signatures in its default configuration, allowing unauthenticated attackers to spoof user identity. Attackers can extract usernames from unsigned Authorization headers and impersonate any user, including service accounts, to read, write, and delete arbitrary data.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
9.3
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/79xxx/CVE-2026-79787.json, https://nvd.nist.gov/vuln/detail/CVE-2026-79787, https://www.vulncheck.com/advisories/alluxio-through-2.9.5-s3-rest-proxy-authentication-bypass-via-unverified-request-signature, https://github.com/Alluxio/alluxio/issues/18755, https://github.com/Alluxio/alluxio, https://github.com/Alluxio/alluxio/blob/v2.9.5/core/server/proxy/src/main/java/alluxio/proxy/s3/S3RestUtils.java

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00455%
EPSS Percentile
0.37495%
Introduced Version
0,2.8.1,2.8.2,2.9.2
Fix Available

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