CVE-2026-115374: high-severity vulnerability in lxc incus
Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 Unsigned Header Bypass in Presigned S3 Upload URLs
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.2%
Incus 7.0.0 before 7.0.2 and 7.1.0 before 7.5.0 contains a signature verification flaw in its built-in S3 server that allows presigned URL holders to inject unsigned x-amz-* headers. Attackers can add an unsigned X-Amz-Copy-Source header to a presigned upload URL to copy other bucket objects onto the granted key, disclosing their contents and ETags.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
lxc · incusRelated CVEs — lxc incus
In the same product, most dangerous first.
CVE-2026-23954HIGHIncus container image templating arbitrary host file read and writeEPSS 0.8%CVE-2026-48769CRITICALIncus has an arbitrary file write on its client due to trusted image hashEPSS 0.7%CVE-2026-48755CRITICALIncus has an argument injection in backup compression algorithm leading to AFW and ACEEPSS 0.7%CVE-2026-48753CRITICALIncus has an arbitrary file write via path traversal in S3 multipart uploadEPSS 0.7%CVE-2026-48752CRITICALIncus has arbitrary file read+write on host via templates/ symlink in malicious imageEPSS 0.7%CVE-2026-48750CRITICALIncus has an arbitrary file write on host via `exec-output` symlink in crafted imageEPSS 0.7%