CVE-2026-63209
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Detection and validation
Mapped metadata availability only. These signals do not change priority.
Sigma
Not mapped by tracked sources.
Atomic
Not mapped by tracked sources.
Nuclei
Not mapped by tracked sources.
What it is
Reportedcompress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.
Source reported · Source: CVE record · Source last published: · Source description excerpt; complete tracked detail loads below. · Source last updated:
What is affected
Reportedklauspost; compress. Product-level identification only; no affected-version conclusion is available from this field.
Source reported · Source: CVE record · Source last published: · Source last updated:
Urgency and basis
ReportedTrack* · 219.8
Tracker computed · Tracker decision tier from the evidence detailed below · Source last updated:
Exploitation evidence
Not reportedNot reported by tracked sources.
What to do
Not reportedNot reported by tracked sources.
Evidence detail
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