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CVE-2026-97032· CVE.org (no NVD analysis yet)· CNA Go

HTTP/2 server crash due to HPACK encoder race in net/http

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.42% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Go standard library net/http 1.26.9; Go standard library net/http/internal/http2 1.27.2; golang.org/x/net golang.org/x/net/http2 0.60.0.

Low priority for now. Upgrade to Go standard library net/http 1.26.9; Go standard library net/http/internal/http2 1.27.2; golang.org/x/net golang.org/x/net/http2 0.60.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently. This happens because the server modifies the HPACK encoder from two goroutines without synchronization: one uses the encoder to encode a HEADERS frame as part of a response sent to a client and the other modifies the encoder's table size when handling a SETTINGS frame containing SETTINGS_HEADER_TABLE_SIZE that a client sends. A malicious client can repeatedly send a request while changing the header table size to crash the server.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Oct 8, 2026
Updated
Oct 15, 2026
EPSS
0.4% · 34th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-97032

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Go). Independent of NVD's CPE analysis and usually ahead of it.

  • Go standard library net/http

    • before 1.26.9affected · semver

  • Go standard library net/http/internal/http2

    • 1.27.0-0 and later · before 1.27.2affected · semver

  • golang.org/x/net golang.org/x/net/http2

    • before 0.60.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12golang-1.19all versions—
Debian:12golang-golang-x-netall versions—
Debian:13golang-1.24all versions—
Debian:14golang-1.26before 1.26.9-11.26.9-1
Debian:14golang-1.27before 1.27.2-11.27.2-1
Debian:14golang-golang-x-netbefore 1:0.60.0-11:0.60.0-1
Gogolang.org/x/netbefore 0.60.00.60.0
Gostdlibfrom 1.27.0-0 · before 1.27.21.27.2
Gostdlibbefore 1.26.91.26.9
openSUSE:Tumbleweedgo1.26before 1.26.9-1.11.26.9-1.1
openSUSE:Tumbleweedgo1.27before 1.27.2-1.11.27.2-1.1
openSUSE:Tumbleweedrclonebefore 1.75.2-1.11.75.2-1.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7go1.26before 1.26.9-150000.1.33.11.26.9-150000.1.33.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7go1.27before 1.27.2-150000.1.12.11.27.2-150000.1.12.1

Same product

go standard library: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-45288HTTP/2 CONTINUATION flood in net/http
    58Plan
  • CVE-2026-78663Double flow control refund on HTTP/2 server streams in net/http
    36Monitor
  • CVE-2026-94439HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http
    30Monitor
  • CVE-2026-78669Excessive CPU consumption from repeated initial window changes in net/http
    30Monitor
  • CVE-2026-78667Lack of limit on size of parsed Range headers in net/http
    30Monitor
  • CVE-2026-78660HTTP/2 transport accepts malformed framing-related headers in net/http
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go standard library net/http1.26.9Vendor (CNA)
Go standard library net/http/internal/http21.27.2Vendor (CNA)
golang.org/x/net golang.org/x/net/http20.60.0Vendor (CNA)
azl3 azurelinux-image-tools 1.6.0-3 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 cert-manager 1.12.15-14 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 cloud-provider-kubevirt 0.5.1-9 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 containerd2 2.3.4-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 containerized-data-importer 1.62.0-8 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 coredns 1.11.4-21 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 docker-buildx 0.14.0-17 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 docker-compose 2.27.0-14 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 etcd 3.5.33-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 flannel 0.24.2-32 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 httpd 2.4.68-1 on Azure Linux 3.019.0.4-15 · Release NotesMicrosoft (MSRC)
azl3 httpd 2.4.68-1 on Azure Linux 3.03.10.182-6 · Release NotesMicrosoft (MSRC)
azl3 httpd 2.4.68-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 influxdb 2.7.5-21 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kata-containers-cc 3.15.0.aks0-21 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 keda 2.14.1-19 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kube-vip-cloud-provider 0.0.10-10 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kubernetes 1.30.10-30 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kubevirt 1.8.4-2 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 moby-containerd-cc 1.7.7-17 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 moby-engine 25.0.3-20 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 multus 4.0.2-11 on Azure Linux 3.04.0.2-12 · Release NotesMicrosoft (MSRC)
azl3 opa 0.63.0-5 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 packer 1.9.5-21 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 prometheus-adapter 0.12.0-10 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 skopeo 1.14.4-13 on Azure Linux 3.01.14.4-14 · Release NotesMicrosoft (MSRC)

+12

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 18, 2026+10 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. CVSS— → 7.5
  2. Severity— → high
  3. SSVC exploitation— → none
  4. Exploit maturity— → none
  5. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records