CVE-2026-86409LowNetworkRevised 4 Nov

stale SigV4 headers sent unintended

MSRC advisory NVD CVE.org

Assessment

Severity: Low
CVSS base score: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Impact: Not stated
EPSS · 30-day forecast: No EPSS score collected
Public detection template: No Nuclei template is listed in the current collected catalog
Exploitation detected: Unknown: not stated by MSRC
Exploitability: Not assessed
Publicly disclosed: Unknown: not stated by MSRC
Customer action: Required: follow the MSRC remediation guidance
Component: Mariner
Weakness: —
Issued by: curl
Published: 23 Oct 2026 · October 2026
Last revised: 4 Nov 2026Information published.

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: NetworkAV:N
Attack complexity: HighAC:H
Privileges required: NonePR:N
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: LowC:L
Integrity: NoneI:N
Availability: NoneA:N

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Open Source Software

1 affected product

azl3 curl 8.11.1-12 on Azure Linux 3.0

What changed

Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
6 Nov 2026 · 17:32:22 UTC
Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
6 Nov 2026 · 16:31:02 UTC

Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version

Field-level log (8)

Up to 100 recent field edits are shown; older edits may be outside retention.

6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete

Explore global source statements, affected packages and advisory history for CVE-2026-86409. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-86409

Published

curl

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "curl",
                    "product": "curl",
                    "versions": [
                        {
                            "version": "8.21.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.21.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.20.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.20.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.19.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.19.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.18.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.18.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.17.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.17.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.16.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.16.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.15.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.15.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.14.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.14.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.14.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.14.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.13.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.13.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.12.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.12.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.12.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.12.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.11.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.11.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.11.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.11.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.10.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.10.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.10.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.10.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.9.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.9.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.9.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.9.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.8.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.8.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.7.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.7.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.7.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.7.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.6.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.6.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.5.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.5.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.4.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.4.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.3.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.3.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.2.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.2.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.2.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.2.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.1.2",
                            "status": "affected",
                            "lessThanOrEqual": "8.1.2",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.1.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.1.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.1.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.1.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.0.1",
                            "status": "affected",
                            "lessThanOrEqual": "8.0.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "8.0.0",
                            "status": "affected",
                            "lessThanOrEqual": "8.0.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.88.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.88.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.88.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.88.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.87.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.87.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.86.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.86.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.85.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.85.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.84.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.84.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.83.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.83.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.83.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.83.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.82.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.82.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.81.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.81.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.80.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.80.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.79.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.79.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.79.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.79.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.78.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.78.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.77.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.77.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.76.1",
                            "status": "affected",
                            "lessThanOrEqual": "7.76.1",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.76.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.76.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.75.0",
                            "status": "affected",
                            "lessThanOrEqual": "7.75.0",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON