CVE & CISA-KEV Catalog

CVE-2026-56853

MEDIUM
7.5
CVSS v3
NVD

Description

When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available
delve-0:1.26.1Rocky
Fixed in:1.module+el8.10.0+24516+40554724.src::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:60305
delve-0:1.26.1Red Hat / RHEL
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.src::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:60305
delve-debuginfo-0:1.26.1Rocky
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:60305
delve-debuginfo-0:1.26.1Red Hat / RHEL
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:60305
delve-debugsource-0:1.26.1Rocky
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:60305
delve-debugsource-0:1.26.1Red Hat / RHEL
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:60305
go-toolsetRocky
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
go-toolsetRed Hat / RHEL
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
go-toolset-0:1.26.7Rocky
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305
go-toolset-0:1.26.7Red Hat / RHEL
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305
golangRed Hat / RHEL
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golangRocky
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-0:1.26.7Rocky
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.src::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
golang-0:1.26.7Red Hat / RHEL
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.src::go-toolset:rhel8RHSA-2026:60305
golang-binRed Hat / RHEL
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-binRocky
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-bin-0:1.26.7Red Hat / RHEL
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
golang-bin-0:1.26.7Rocky
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305
golang-docsRocky
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-docsRed Hat / RHEL
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-docs-0:1.26.7Rocky
Fixed in:1.module+el8.10.0+24751+b3673b3e.noarch::go-toolset:rhel8RHSA-2026:60305
golang-docs-0:1.26.7Red Hat / RHEL
Fixed in:1.module+el8.10.0+24751+b3673b3e.noarch::go-toolset:rhel8RHSA-2026:60305
golang-miscRocky
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-miscRed Hat / RHEL
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-misc-0:1.26.7Red Hat / RHEL
Fixed in:1.module+el8.10.0+24751+b3673b3e.noarch::go-toolset:rhel8RHSA-2026:60305
golang-misc-0:1.26.7Rocky
Fixed in:1.module+el8.10.0+24751+b3673b3e.noarch::go-toolset:rhel8RHSA-2026:60305
golang-raceRocky
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-raceRed Hat / RHEL
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el10_2RHSA-2026:60306
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
Fixed in:0:1.26.7-1.el9_8RHSA-2026:60304
golang-race-0:1.26.7Red Hat / RHEL
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
golang-race-0:1.26.7Rocky
Fixed in:1.module+el8.10.0+24751+b3673b3e.x86_64::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.s390x::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.ppc64le::go-toolset:rhel8RHSA-2026:60305
Fixed in:1.module+el8.10.0+24751+b3673b3e.aarch64::go-toolset:rhel8RHSA-2026:60305

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U

Exploit Intelligence

0.57%probability of exploitation in 30 days
45thpercentile

Moderate risk: more likely to be exploited than 45% of all known CVEs.

References

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2023-50387High7.5100%-Fix
CVE-2019-11478Medium5.393%-Fix
CVE-2019-11479High7.592%-Fix
CVE-2024-27316High7.591%-Fix
CVE-2022-30522High7.590%-Fix
CVE-2019-9515High7.587%-Fix

Common questions

How do I fix CVE-2026-56853?

Published advisories record a fix for 44 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-56853 being actively exploited?

Not that we know of. CVE-2026-56853 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.57% is the estimated probability that it will be exploited in the next 30 days. That is higher than 45% of all scored CVEs.

How severe is CVE-2026-56853?

CVE-2026-56853 has a CVSS v3 base score of 7.5, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-56853 affect?

Published advisories record a fix for delve-0:1.26.1 (Rocky), delve-0:1.26.1 (Red Hat / RHEL), delve-debuginfo-0:1.26.1 (Rocky), delve-debuginfo-0:1.26.1 (Red Hat / RHEL), and 40 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-56853
CVE-2026-56853 severity badge

Markdown

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See how it worksStart freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-14.