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Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-56819

Denial of Service via HTTP/2 DATA frame memory leak

CVE-2026-56819: Denial of Service via HTTP/2 DATA frame memory leak. Not in the CISA KEV catalog. High advisory severity (CVSS 7.5, Red Hat).

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-56819 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
High
CVSS base score
7.5 (Red Hat)
Fixed releases
  • Red Hat: 4.1.136, 4.2.16, cryostat/cryostat-reports-rhel9:4.2.0-14, cryostat/cryostat-rhel9:4.2.0-14, cryostat/jfr-datasource-rhel9:4.2.0-14, netty-codec-http2 and 30 more in the advisory
Vendor advisories
2 from NetApp, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-56819; bulletin-wide values are not repeated here.

Is CVE-2026-56819 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-56819 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-56819?

Upgrade to a fixed release named by the vendor:

  • Red Hat: 4.1.136, 4.2.16, cryostat/cryostat-reports-rhel9:4.2.0-14, cryostat/cryostat-rhel9:4.2.0-14, cryostat/jfr-datasource-rhel9:4.2.0-14, netty-codec-http2
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory
  • Advisory severityHigh8.1

    High [CVE-2026-44249 +6] September 2026 IBM Db2 Netty Vulnerabilities in NetApp Products

    NTAP-20260917-0005Source published Source updated

    This bulletin covers 7 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.

    IBM Db2 Server 11.5.0 through 11.5.9 on Linux x86-64 are susceptible to vulnerabilities in Netty open source libraries. Successful exploitation of these vulnerabilities could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). NetApp states there is no workaround available at this time.

    Affected products in this advisory
    No product details extracted. Check the source bulletin.
    Source-reported affected versions
    • 11.5.0
    • 11.5.9
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-56819] Denial of Service via HTTP/2 DATA frame memory leak

    CVE-2026-56819Source published Source updated

    Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, a remote unauthenticated peer can leak one direct `ByteBuf` per HTTP/2 `DATA` frame in applications that enable HTTP/2 content decompression via `DelegatingDecompressorFrameListener`. When a `DATA` frame is processed for a stream whose decompressor has already been closed, `Http2Decompressor.decompress(...)` calls `decompressor.writeInbound(data.retain())` and does not release the retained buffer on the error path, eventually exhausting direct memory and crashing the JVM. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final. A remote, unauthenticated attacker can exploit this vulnerability by sending…

    Affected products in this advisory
    • Cryostat 4 on RHEL 9
    • Red Hat AMQ Broker 7.14.1
    • Red Hat Build of Apache Camel 3.33.2.SP3
    • Red Hat build of Apache Camel 4.18.3 for Spring Boot 3.5.16

    21 more entries in the full advisory.

    Source-reported affected versions
    • 4.2.0
    • 4.2.15
    • 4.1.0
    • 4.1.135
    Source-reported fixed versions
    • 4.1.136
    • 4.2.16
    • cryostat/cryostat-reports-rhel9:4.2.0-14
    • cryostat/cryostat-rhel9:4.2.0-14

    32 more entries in the full advisory.

    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

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