CVE-2026-84445: gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers
Noroxi assessment
Priority: Monitor (action score 34/100)
- 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: 0.64% (FIRST EPSS); higher than 50.4% of all records.
- 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: azl3 azcopy 10.25.1-8 on Azure Linux 3.0 10.25.1-9; azl3 azurelinux-image-tools 1.6.0-2 on Azure Linux 3.0 1.6.0-3; azl3 cert-manager 1.12.15-12 on Azure Linux 3.0 1.12.15-14.
Low priority for now. Upgrade to azl3 azcopy 10.25.1-8 on Azure Linux 3.0 10.25.1-9; azl3 azurelinux-image-tools 1.6.0-2 on Azure Linux 3.0 1.6.0-3; azl3 cert-manager 1.12.15-12 on Azure Linux 3.0 1.12.15-14 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
gRPC-Go is the Go language implementation of gRPC. Prior to 1.82.2 and 1.83.2, servers created with xds.NewGRPCServer() allow internal/transport/http2_server.go to accept an RPC containing neither the :authority header nor the Host header, while RouteAndProcess in internal/xds/server/routing.go assumes that an authority value exists and indexes the empty slice. A remote client that can complete transport connection establishment can trigger an index-out-of-bounds panic that is not recovered by the per-RPC goroutine and terminates the entire server process. In insecure or ordinary TLS deployments the request can be unauthenticated, while strict mTLS or ALTS deployments require valid transport credentials before the malformed RPC can reach the interceptor. This issue is fixed in versions 1.82.2 and 1.83.2.
- EUVD-2026-77627
- GHSA-2v4p-qf9q-27wj
- ALSA-2026:76743
- ALSA-2026:76744
- GO-2026-6443
- openSUSE-SU-2026:11686-1
- openSUSE-SU-2026:11695-1
- openSUSE-SU-2026:11697-1
- openSUSE-SU-2026:11699-1
- openSUSE-SU-2026:11700-1
- openSUSE-SU-2026:11713-1
- openSUSE-SU-2026:11718-1
- openSUSE-SU-2026:11740-1
- openSUSE-SU-2026:11743-1
- openSUSE-SU-2026:11828-1
- openSUSE-SU-2026:11830-1
- openSUSE-SU-2026:11837-1
- openSUSE-SU-2026:11911-1
- openSUSE-SU-2026:11920-1
- openSUSE-SU-2026:11931-1
- Published
- Sep 14, 2026
- Updated
- Sep 25, 2026
- EPSS
- 0.6% · 50th percentile
- CWE
- CWE-129
Report tools
Action score
34
Monitor
Low priority for now.
- CVSS
- 34 / 40 · 8.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · GitHub_M
- 8.7
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
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.
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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.
We use this product, ask for helpAffected 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 (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
grpc grpc-go
- < 1.82.2, >= 1.83.0, < 1.83.2affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | opentelemetry-collector | before 0.158.0-1.el10_2 | 0.158.0-1.el10_2 |
| AlmaLinux:9 | opentelemetry-collector | before 0.158.0-1.el9_8 | 0.158.0-1.el9_8 |
| Debian:12 | golang-google-grpc | from 0 | — |
| Go | google.golang.org/grpc | from 1.83.0 · before 1.83.2 | 1.83.2 |
| Go | google.golang.org/grpc | from 1.84.0-dev · before 1.84.0-dev.0.20260825144003-d5a41119e0e3 | 1.84.0-dev.0.20260825144003-d5a41119e0e3 |
| Go | google.golang.org/grpc | from 1.85.0-dev · before 1.85.0-dev.0.20260825072537-93e31b48545e | 1.85.0-dev.0.20260825072537-93e31b48545e |
| Go | google.golang.org/grpc | before 1.82.2 | 1.82.2 |
| openSUSE:Leap 16.0 | amazon-ecs-init | before 1.108.0-160000.1.1 | 1.108.0-160000.1.1 |
| openSUSE:Leap 16.0 | apptainer | before 1.5.3-bp160.4.1 | 1.5.3-bp160.4.1 |
| openSUSE:Leap 16.0 | cadvisor | before 0.60.5-bp160.2.1 | 0.60.5-bp160.2.1 |
| openSUSE:Leap 16.0 | distribution | before 3.1.1-160000.3.1 | 3.1.1-160000.3.1 |
| openSUSE:Leap 16.0 | gh | before 2.102.0-bp160.1.1 | 2.102.0-bp160.1.1 |
| openSUSE:Leap 16.0 | google-cloud-sap-agent | before 3.15-160000.4.1 | 3.15-160000.4.1 |
| openSUSE:Leap 16.0 | google-guest-agent | before 20260903.01-160000.1.1 | 20260903.01-160000.1.1 |
| openSUSE:Leap 16.0 | google-osconfig-agent | before 20260911.00-160000.1.1 | 20260911.00-160000.1.1 |
| openSUSE:Leap 16.0 | hauler | before 2.1.0-bp160.3.1 | 2.1.0-bp160.3.1 |
| openSUSE:Leap 16.0 | helm | before 3.21.3-160000.2.1 | 3.21.3-160000.2.1 |
| openSUSE:Leap 16.0 | mcphost | before 0.34.0-160000.5.1 | 0.34.0-160000.5.1 |
| openSUSE:Leap 16.0 | trivy | before 0.74.0-160000.2.1 | 0.74.0-160000.2.1 |
| openSUSE:Leap 16.0 | v2ray-core | before 5.54.2-bp160.1.1 | 5.54.2-bp160.1.1 |
| openSUSE:Tumbleweed | alloy | before 1.20.1-1.1 | 1.20.1-1.1 |
| openSUSE:Tumbleweed | amazon-cloudwatch-agent | before 1.300072.0-1.1 | 1.300072.0-1.1 |
| openSUSE:Tumbleweed | amazon-ecs-init | before 1.108.0-1.1 | 1.108.0-1.1 |
| openSUSE:Tumbleweed | apptainer | before 1.5.3-4.1 | 1.5.3-4.1 |
+76
Same product
grpc: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-84304gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation34Monitor
- CVE-2026-84303gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion25Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| azl3 azcopy 10.25.1-8 on Azure Linux 3.0 | 10.25.1-9 | Microsoft (MSRC) |
| azl3 azurelinux-image-tools 1.6.0-2 on Azure Linux 3.0 | 1.6.0-3 | Microsoft (MSRC) |
| azl3 cert-manager 1.12.15-12 on Azure Linux 3.0 | 1.12.15-14 | Microsoft (MSRC) |
| azl3 cf-cli 8.7.11-8 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 cloud-provider-kubevirt 0.5.1-7 on Azure Linux 3.0 | 0.5.1-9 | Microsoft (MSRC) |
| azl3 containerd2 2.2.4-8 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 containerd2 2.3.4-1 on Azure Linux 3.0 | 2.4.0-1 · Release Notes | Microsoft (MSRC) |
| azl3 containerized-data-importer 1.62.0-7 on Azure Linux 3.0 | 1.62.0-8 | Microsoft (MSRC) |
| azl3 coredns 1.11.4-20 on Azure Linux 3.0 | 1.11.4-21 | Microsoft (MSRC) |
| azl3 cri-tools 1.32.0-7 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 cri-tools 1.32.0-8 on Azure Linux 3.0 | Release Notes | Microsoft (MSRC) |
| azl3 docker-buildx 0.14.0-16 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 docker-buildx 0.14.0-17 on Azure Linux 3.0 | Release Notes | Microsoft (MSRC) |
| azl3 docker-compose 2.27.0-13 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 docker-compose 2.27.0-14 on Azure Linux 3.0 | 2.27.0-15 · Release Notes | Microsoft (MSRC) |
| azl3 etcd 3.5.33-1 on Azure Linux 3.0 | 3.5.34-1 · Release Notes | Microsoft (MSRC) |
| azl3 flannel 0.24.2-31 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 flannel 0.24.2-32 on Azure Linux 3.0 | 0.24.2-33 · Release Notes | Microsoft (MSRC) |
| azl3 gh 2.98.0-1 on Azure Linux 3.0 | 2.101.0-1 | Microsoft (MSRC) |
| azl3 influxdb 2.7.5-20 on Azure Linux 3.0 | 2.7.5-21 | Microsoft (MSRC) |
| azl3 kata-containers 3.32.0.kata0-5 on Azure Linux 3.0 | 3.32.0.kata0-6 | Microsoft (MSRC) |
| azl3 kata-containers-cc 3.15.0.aks0-20 on Azure Linux 3.0 | 3.15.0.aks0-21 | Microsoft (MSRC) |
| azl3 keda 2.14.1-18 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 keda 2.14.1-19 on Azure Linux 3.0 | 2.14.1-21 · Release Notes | Microsoft (MSRC) |
| azl3 kube-vip-cloud-provider 0.0.10-8 on Azure Linux 3.0 | 0.0.10-10 | Microsoft (MSRC) |
| azl3 kubernetes 1.30.10-29 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 kubernetes 1.30.10-30 on Azure Linux 3.0 | 1.30.10-31 · Release Notes | Microsoft (MSRC) |
| azl3 kubevirt 1.8.4-1 on Azure Linux 3.0 | — | Microsoft (MSRC) |
| azl3 kubevirt 1.8.4-2 on Azure Linux 3.0 | 1.8.4-3 · Release Notes | Microsoft (MSRC) |
| azl3 moby-containerd-cc 1.7.7-16 on Azure Linux 3.0 | — | Microsoft (MSRC) |
+49
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.
No dated events beyond publication.
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.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
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
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-129 · Improper Validation of Array IndexCVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (9 more)Show less
- github.com/grpc/grpc-go/commit/8668b69c167df908b6b3666dcbf40992b9e932a4
- github.com/grpc/grpc-go/commit/93e31b48545e2a8aaeb6e06b47fb249f94e6297f
- github.com/grpc/grpc-go/issues/9354
- github.com/grpc/grpc-go/pull/9365
- github.com/grpc/grpc-go/pull/9366
- github.com/grpc/grpc-go/pull/9367
- github.com/grpc/grpc-go/releases/tag/v1.82.2
- github.com/grpc/grpc-go/releases/tag/v1.83.2
- github.com/grpc/grpc-go/security/advisories/GHSA-2v4p-qf9q-27wj
Vendor advisories and official records. Exploit/PoC links are deliberately left out.