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CVE-2026-54330 is an improper verification of cryptographic signatures vulnerability in Ceph RADOS Gateway (RGW) affecting the SigV4 request verification path for presigned PUT requests. RGW verifies only the headers explicitly listed in the X-Amz-SignedHeaders element of the SigV4 request and fails to reject additional unsigned x-amz-* headers. As a result, an attacker in possession of a valid presigned PUT URL can append arbitrary x-amz-* headers that are not covered by the signature, and RGW will still accept and apply them. This breaks the security assumptions of AWS Signature Version 4 by allowing request semantics to be altered after signing, granting capabilities beyond those intended by the signer.
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What an attacker gets, and what they’ve been doing with it.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability referenced in a Fedora security advisory for the ceph package; it is the CVSS score source in this notice.
A vulnerability affecting Fedora 44 ceph packages, identified as the CVSS score source in this Fedora security notice.
An unpatched vulnerability tracked as CVE-2026-54330, referenced in a Nessus plugin for Debian Linux systems and associated with high CVSS v3 severity.
A vulnerability in Ceph RGW where SigV4 cryptographic signatures are not properly verified.
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.