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Curl CVE-2026-3783

MEDIUM
Insufficiently Protected Credentials (CWE-522)
2026-03-11 2499f714-1537-4658-8207-48ae4bb9eae9
Information Disclosure Curl Haxx
5.3
CVSS 3.1 · Vendor: 2499f714-1537-4658-8207-48ae4bb9eae9
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Vulnerability Assessment

Weakness
CWE
CWE-522
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V6 - Authentication Credential protection in transit/storage
Impact

CVSS 5.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Public exploit/POC available.
Exploit ScenarioDerived

An attacker could exploit this vulnerability to compromise the affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

OAuth2 bearer token leakage in curl and .NET occurs when HTTP redirects are followed to a second hostname that matches entries in the .netrc configuration file, allowing attackers to obtain valid authentication tokens for unintended hosts. Public exploit code exists for this vulnerability affecting curl and .NET applications that rely on OAuth2 authentication with automatic redirect handling. This medium-severity vulnerability (CVSS 5.3) requires network access but no user interaction, and patches are available from vendors.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 22:06 CVSS 5.3

When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances. [CVSS 5.3 MEDIUM]

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

Affects your stack

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Technical ContextAI · show details

Classified as CWE-522 (Insufficiently Protected Credentials). Affects Curl. When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances.

If the hostname that the first request is redirected to has information in the used .netrc file, with either of the machine or default keywords, curl would pass on the bearer token set for the first host also to the second one.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (2499f714-1537-4658-8207-48ae4bb9eae9) PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SUSE MEDIUM
Red Hat 5.7 MEDIUM

Primary rating from Vendor (2499f714-1537-4658-8207-48ae4bb9eae9).

CVSS VectorVendor: 2499f714-1537-4658-8207-48ae4bb9eae9

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
PoC Detected
Mar 12, 2026 - 14:10 vuln.today
Public exploit code
Patch released
Mar 12, 2026 - 14:10 nvd
Patch available
CVE Published
Mar 11, 2026 - 11:16 nvd
MEDIUM 5.3

DescriptionCVE.org

When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer performs a redirect to a second URL, curl could leak that token to the second hostname under some circumstances.

If the hostname that the first request is redirected to has information in the used .netrc file, with either of the machine or default keywords, curl would pass on the bearer token set for the first host also to the second one.

Executive ViewAI

Why It Matters

Organizations using When an OAuth2 bearer token should be aware of moderate risk from CVE-2026-3783 rated CVSS 5.3. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 92% exploitable
Exploit
POC
Public exploit code exists
Data Quality
5 sources
Confidence: Medium
NVD CVE.org EPSS Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Low

Priority Score

46
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

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Same weakness CWE-522 – Insufficiently Protected Credentials

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Same technique Information Disclosure

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CVE-2025-68613 HIGH POC
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CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/ltss/sle12.5/sles12sp5:8.5.210 Affected
Container suse/manager/4.3/proxy-httpd:4.3.16.2.9.73.25 Container suse/manager/4.3/proxy-salt-broker:4.3.16.2.9.63.26 Container suse/sle-micro/base-5.5:2.0.4-5.8.252 Image SLES15-SP5-Micro-5-5 Image SLES15-SP5-Micro-5-5-Azure Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Affected
Container suse/manager/5.0/x86_64/proxy-httpd:latest Container suse/manager/5.0/x86_64/proxy-salt-broker:latest Container suse/manager/5.0/x86_64/server:latest Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Affected
Container suse/manager/5.0/x86_64/server-hub-xmlrpc-api:latest Container suse/manager/5.0/x86_64/server-migration-14-16:latest Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.140 Affected

References

Advisories & patches
PATCH https://curl.se/docs/CVE-2026-3783.html ADVISORY https://curl.se/docs/CVE-2026-3783.json ADVISORY https://ubuntu.com/security/notices/USN-8084-1 ADVISORY https://vuldb.com/?id.350375 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0879/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0885/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0903/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0911/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0921/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20668/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20722/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20760/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20918/ REF http://www.openwall.com/lists/oss-security/2026/03/11/2

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