Libmodulemd: libmodulemd: missing decompressed-size limit when parsing compressed yaml
Impact
A flaw in libmodulemd allows an attacker to cause excessive CPU and memory consumption with a highly compressible compressed YAML file, resulting in a denial of service. The issue affects Red Hat Enterprise Linux 8, 9, and 10, among other products. An attacker must be able to supply a compressed YAML file to exploit the vulnerability.
Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.What to do
Until a fix is available, avoid parsing attacker-controlled compressed module metadata in rpmio-enabled builds. Where compressed input is required, decompress outside the process under strict size quotas, or reject files whose decompressed size exceeds a conservative limit before passing data to libmodulemd. Building without rpmio support removes the affected path.
Affected packages
Affected products
Vendor version evidence. Product records are separate from automatic dependency matching.
Red Hat · redhat
Red Hat Enterprise Linux 10
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Red Hat · redhat
Red Hat Enterprise Linux 10
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Other versions: affected
Product identifiers (CPE)
cpe:/o:redhat:enterprise_linux:10Red Hat · redhat
Red Hat Enterprise Linux 8
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Red Hat · redhat
Red Hat Enterprise Linux 8
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Other versions: affected
Product identifiers (CPE)
cpe:/o:redhat:enterprise_linux:8Red Hat · redhat
Red Hat Enterprise Linux 9
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Red Hat · redhat
Red Hat Enterprise Linux 9
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Other versions: affected
Product identifiers (CPE)
cpe:/o:redhat:enterprise_linux:9Red Hat · redhat
Red Hat Hardened Images
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Red Hat · redhat
Red Hat Hardened Images
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Other versions: affected
Product identifiers (CPE)
cpe:/a:redhat:hummingbird:1Red Hat · redhat
Red Hat OpenShift Container Platform 4
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Red Hat · redhat
Red Hat OpenShift Container Platform 4
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Other versions: affected
Product identifiers (CPE)
cpe:/a:redhat:openshift:4Red Hat · redhat
Red Hat OpenShift Container Platform 4
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Red Hat · redhat
Red Hat OpenShift Container Platform 4
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Other versions: affected
Product identifiers (CPE)
cpe:/a:redhat:openshift:4Red Hat · redhat
Red Hat OpenShift Container Platform 5
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Red Hat · redhat
Red Hat OpenShift Container Platform 5
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Other versions: affected
Product identifiers (CPE)
cpe:/a:redhat:openshift:5Original source description
A flaw was found in libmodulemd. In builds with rpmio support enabled, compressed modulemd YAML is decompressed through a custom read handler that does not enforce a cumulative decompressed-size limit before parsing. An attacker who can supply a highly compressible compressed YAML file can cause excessive CPU and memory consumption, resulting in a denial of service.
Inside the record
Evidence available
Describes the evidence in this view, not whether the product is safe.
Original records
CVE-2026-92823View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.
cve.new JSON →Underlying weaknesses
The source’s classification of what caused the vulnerability.
Contributing organizations · 2
Assigning organization
Additional data publisher
What changed
Follow changesLarge field values are marked as truncated previews. Original source snapshots remain retained.