It was discovered that the Ceph Object Gateway (RGW) SigV4 handler did not reject requests carrying x-amz-* headers that were absent from the signed header set. An attacker holding a presigned URL could possibly use this issue to attach arbitrary unsigned x-amz-* headers that RGW would honor, allowing them to escalate their privileges beyond what the URL's signer intended.
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"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
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{
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"type": "Ubuntu"
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]
}
],
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}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8867-1.json"
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{
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"id": "CVE-2026-54330",
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{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
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{
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"type": "Ubuntu"
}
]
}
],
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}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8867-1.json"
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"availability": "No subscription required",
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{
"cves": [
{
"id": "CVE-2026-54330",
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{
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},
{
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"type": "Ubuntu"
}
]
}
],
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}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8867-1.json"
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{
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{
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{
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{
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]
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],
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}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8867-1.json"