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curl EUVDEUVD-2026-29930

| CVE-2026-6429 MEDIUM
Information Exposure (CWE-200)
5.3
CVSS 3.1 · Vendor
View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Local access to system
  2. Delivery
    Locate target curl process with netrc file
  3. Exploit
    Trigger sequential requests via same proxy
  4. Execution
    Reused connection leaks netrc credentials
  5. Persist
    Extract credential from process memory or connection state
  6. Impact
    Unauthorized proxy access

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V14 - Data Protection Data exposure prevention
MITRE ATT&CK

2 techniques across 2 tactics: Collection, Discovery

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires all of the following: (1) curl must be installed and in use with netrc file configured (typically ~/.netrc with proxy credentials); (2) the attacker must have local system access or ability to monitor/influence curl process behavior; (3) curl connection pooling must be enabled (default behavior) and multiple requests must be made in sequence such that a proxy connection from the first request is reused for a second request; (4) the second request must target a context where the original netrc credentials are not intended to apply, triggering the credential leak. Non-default configurations using only environment variable credentials or disabling netrc entirely prevent exploitation. The vulnerability does NOT affect curl instances without netrc files, remote-only attackers without local access, or deployments that disable connection pooling. High attack complexity reflects the requirement to align multiple conditions: netrc presence, local access, and specific request sequencing.

Impact

The risk profile is markedly lower than the CVSS 5.3 score alone suggests. CVSS 5.3 (AV:N/AC:H/PR:L/UI:N) indicates network-accessible attack surface requiring low-privilege authentication and high attack complexity, with impact limited to credential confidentiality. However, EPSS 0.02% (4th percentile) contradicts typical assumptions about credential-leak severity, suggesting either very low practical exploitability or highly specific preconditions not apparent from the description. The vulnerability requires an authenticated local attacker with curl installed and a netrc file configured, plus specific connection pooling conditions to trigger. No KEV status is provided, and no public exploit code is identified. The broad affected version range (7.14.0-8.19.0) increases blast radius but actual exploitation requires deliberate netrc setup and local access. Compare: this is a confidentiality leak in a legacy credential file format on a local system, not remote code execution or unauthenticated access. Real-world risk depends heavily on whether netrc usage is common in target environments and whether connection reuse patterns trigger the leak deterministically.

Exploit ScenarioDerived

An attacker with local system access (low-privilege user) monitors another user's curl usage patterns, noting that the target user has a netrc file configured with credentials for a proxy server. The attacker crafts a scenario where they can trigger curl to make successive requests-e.g., by modifying a web scraping script or API client the target runs-where the first request establishes a connection to the proxy and the second request is routed through the same pooled proxy connection but targets a different endpoint. Through connection pool inspection or by capturing network/memory state during the reused connection, the attacker extracts the netrc-stored proxy credentials for later unauthorized access.

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 – May 13, 2026

curl versions 7.14.0 through 8.19.0 leak netrc credentials when reusing proxy connections, allowing authenticated local attackers to obtain sensitive authentication data via connection pooling that ignores credential requirements. CVSS 5.3 reflects high confidentiality impact but requires low-privilege authentication and high attack complexity; EPSS 0.02% indicates minimal real-world exploitation probability despite broad version coverage. No public exploit code identified at time of analysis.

RemediationAI

Upgrade curl to the patched version released by the curl project (exact fix version not specified in available data; consult https://curl.se/docs/CVE-2026-6429.html and the oss-security disclosure at https://www.openwall.com/lists/oss-security/2026/04/29 for the specific release version). Until patching is possible, mitigate by avoiding netrc file usage and instead passing credentials via environment variables (CURL_NETRC_FILE unset) or command-line flags, which bypass the pooled connection logic. Alternatively, disable connection reuse for requests using netrc credentials by setting CURLOPT_FRESH_CONNECT or using the --disable-epsv flag depending on curl version. For systems where curl is embedded or compiled into applications, ensure library dependencies are updated to the patched version-note that binary curl upgrades alone will not fix statically-linked applications. Trade-off: disabling connection pooling reduces performance for high-volume request scenarios but eliminates the reuse-based credential leak vector.

Affected VersionsENISA

curl 7.21.2 ≤7.21.2
curl 7.19.5 ≤7.19.5
curl 7.83.1 ≤7.83.1
curl 8.4.0 ≤8.4.0
curl 7.33.0 ≤7.33.0
curl 7.47.1 ≤7.47.1
curl 7.71.0 ≤7.71.0
curl 7.19.3 ≤7.19.3
curl 8.7.1 ≤8.7.1
curl 8.12.1 ≤8.12.1
curl 7.50.1 ≤7.50.1
curl 7.43.0 ≤7.43.0
curl 7.15.5 ≤7.15.5
curl 7.23.0 ≤7.23.0
curl 7.19.0 ≤7.19.0
curl 7.19.2 ≤7.19.2
curl 7.21.6 ≤7.21.6
curl 8.1.1 ≤8.1.1
curl 7.52.0 ≤7.52.0
curl 8.0.0 ≤8.0.0
curl 8.15.0 ≤8.15.0
curl 7.68.0 ≤7.68.0
curl 7.50.3 ≤7.50.3
curl 8.10.0 ≤8.10.0
curl 8.6.0 ≤8.6.0
curl 7.55.1 ≤7.55.1
curl 8.11.0 ≤8.11.0
curl 7.15.4 ≤7.15.4
curl 7.62.0 ≤7.62.0
curl 7.21.0 ≤7.21.0
curl 7.21.5 ≤7.21.5
curl 8.18.0 ≤8.18.0
curl 7.57.0 ≤7.57.0
curl 7.77.0 ≤7.77.0
curl 7.28.1 ≤7.28.1
curl 7.88.0 ≤7.88.0
curl 7.58.0 ≤7.58.0
curl 8.8.0 ≤8.8.0
curl 7.50.2 ≤7.50.2
curl 7.50.0 ≤7.50.0
curl 7.37.1 ≤7.37.1
curl 7.59.0 ≤7.59.0
curl 7.45.0 ≤7.45.0
curl 8.11.1 ≤8.11.1
curl 8.14.0 ≤8.14.0
curl 8.10.1 ≤8.10.1
curl 7.19.4 ≤7.19.4
curl 7.44.0 ≤7.44.0
curl 7.84.0 ≤7.84.0
curl 7.54.0 ≤7.54.0
curl 7.73.0 ≤7.73.0
curl 8.9.0 ≤8.9.0
curl 8.0.1 ≤8.0.1
curl 7.30.0 ≤7.30.0
curl 7.37.0 ≤7.37.0
curl 8.7.0 ≤8.7.0
curl 7.80.0 ≤7.80.0
curl 7.38.0 ≤7.38.0
curl 7.56.1 ≤7.56.1
curl 8.2.1 ≤8.2.1
curl 8.13.0 ≤8.13.0
curl 7.82.0 ≤7.82.0
curl 7.16.1 ≤7.16.1
curl 7.31.0 ≤7.31.0
curl 7.88.1 ≤7.88.1
curl 7.25.0 ≤7.25.0
curl 7.35.0 ≤7.35.0
curl 7.69.1 ≤7.69.1
curl 7.22.0 ≤7.22.0
curl 7.64.0 ≤7.64.0
curl 7.29.0 ≤7.29.0
curl 7.28.0 ≤7.28.0
curl 7.21.3 ≤7.21.3
curl 7.14.0 ≤7.14.0
curl 7.75.0 ≤7.75.0
curl 7.20.0 ≤7.20.0
curl 7.19.6 ≤7.19.6
curl 7.19.1 ≤7.19.1
curl 7.41.0 ≤7.41.0
curl 8.17.0 ≤8.17.0
curl 7.61.1 ≤7.61.1
curl 8.5.0 ≤8.5.0
curl 8.19.0 ≤8.19.0
curl 7.66.0 ≤7.66.0
curl 7.46.0 ≤7.46.0
curl 7.83.0 ≤7.83.0
curl 7.74.0 ≤7.74.0
curl 7.18.0 ≤7.18.0
curl 7.20.1 ≤7.20.1
curl 7.27.0 ≤7.27.0
curl 7.34.0 ≤7.34.0
curl 7.86.0 ≤7.86.0
curl 7.48.0 ≤7.48.0
curl 7.15.2 ≤7.15.2
curl 7.15.1 ≤7.15.1
curl 8.3.0 ≤8.3.0
curl 7.26.0 ≤7.26.0
curl 7.21.4 ≤7.21.4
curl 7.65.3 ≤7.65.3
curl 7.18.1 ≤7.18.1
curl 7.79.0 ≤7.79.0
curl 7.65.0 ≤7.65.0
curl 7.47.0 ≤7.47.0
curl 7.49.0 ≤7.49.0
curl 8.14.1 ≤8.14.1
curl 7.67.0 ≤7.67.0
curl 7.78.0 ≤7.78.0
curl 7.17.1 ≤7.17.1
curl 7.23.1 ≤7.23.1
curl 7.69.0 ≤7.69.0
curl 7.42.1 ≤7.42.1
curl 7.65.2 ≤7.65.2
curl 7.81.0 ≤7.81.0
curl 7.39.0 ≤7.39.0
curl 7.72.0 ≤7.72.0
curl 8.2.0 ≤8.2.0
curl 7.52.1 ≤7.52.1
curl 7.21.7 ≤7.21.7
curl 7.60.0 ≤7.60.0
curl 7.16.3 ≤7.16.3
curl 7.79.1 ≤7.79.1
curl 7.32.0 ≤7.32.0
curl 7.36.0 ≤7.36.0
curl 7.87.0 ≤7.87.0
curl 7.55.0 ≤7.55.0
curl 7.24.0 ≤7.24.0
curl 7.16.2 ≤7.16.2
curl 7.61.0 ≤7.61.0
curl 7.64.1 ≤7.64.1
curl 7.15.0 ≤7.15.0
curl 7.54.1 ≤7.54.1
curl 8.1.0 ≤8.1.0
curl 7.18.2 ≤7.18.2
curl 8.12.0 ≤8.12.0
curl 7.51.0 ≤7.51.0
curl 7.40.0 ≤7.40.0
curl 7.14.1 ≤7.14.1
curl 7.53.1 ≤7.53.1
curl 7.17.0 ≤7.17.0
curl 7.16.0 ≤7.16.0
curl 7.71.1 ≤7.71.1
curl 7.16.4 ≤7.16.4
curl 7.65.1 ≤7.65.1
curl 8.16.0 ≤8.16.0
curl 7.76.1 ≤7.76.1
curl 8.1.2 ≤8.1.2
curl 7.15.3 ≤7.15.3
curl 7.56.0 ≤7.56.0
curl 7.85.0 ≤7.85.0
curl 7.63.0 ≤7.63.0
curl 7.21.1 ≤7.21.1
curl 7.19.7 ≤7.19.7
curl 7.76.0 ≤7.76.0
curl 7.70.0 ≤7.70.0
curl 7.42.0 ≤7.42.0
curl 8.9.1 ≤8.9.1
curl 7.53.0 ≤7.53.0
curl 7.49.1 ≤7.49.1

Affected Packages

euvd curl no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

curl's connection pooling mechanism, which optimizes performance by reusing HTTP/HTTPS connections across multiple requests, fails to properly validate that netrc-stored proxy credentials are applicable when reusing a cached connection. The netrc file (standard Unix credential storage) contains user authentication credentials typically loaded for specific hosts or proxies. When curl reuses a proxy connection from its connection pool for a subsequent request to a different target, the pooling logic does not verify whether the original netrc credentials are still valid for the new request context, potentially exposing credentials that should not apply. This is distinct from other CVEs in the same disclosure batch (CVE-2026-5545, CVE-2026-5773) which address similar connection reuse failures in HTTP Negotiate and SMB protocols. The vulnerability affects curl's core connection management and credential handling across versions spanning over a decade of releases (7.14.0 through 8.19.0 per EUVD data).

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Severity by source

Vendor (CNA) PRIMARY 5.3 MEDIUM
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
SUSE MEDIUM
Red Hat 6.5 MEDIUM

Primary rating from Vendor (CNA).

CVSS VectorVendor

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

Lifecycle Timeline

3
CVSS changed
May 13, 2026 - 15:52 NVD
5.3 (MEDIUM)
CVE Published
May 08, 2026 - 06:45 nvd
UNKNOWN (no severity yet)
CVE Published
May 08, 2026 - 06:45 nvd
MEDIUM 5.3

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Threat Intelligence Overview

EPSS Score
0.0%
Top 96% exploitable
Social Media
4
Sightings
Data Quality
7 sources
Confidence: High

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 No
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
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

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

Attack Technique

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

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/manager/4.3/proxy-httpd:4.3.17.9.76.18 Container suse/manager/4.3/proxy-salt-broker:4.3.17.9.66.20 Container suse/sle-micro-rancher/5.3:latest Container suse/sle-micro-rancher/5.4:5.4.4.5.106 Container suse/sle-micro/5.3/toolbox:16.3-6.11.222 Container suse/sle-micro/5.4/toolbox:16.3-5.19.222 Container suse/sle-micro/5.5/toolbox:16.3-3.12.133 Container suse/sle-micro/base-5.5:2.0.4-5.8.271 Image SLES15-SP4-BYOS Image SLES15-SP4-BYOS-Azure Image SLES15-SP4-BYOS-EC2 Image SLES15-SP4-BYOS-GCE Image SLES15-SP4-CHOST-BYOS Image SLES15-SP4-CHOST-BYOS-Aliyun Image SLES15-SP4-CHOST-BYOS-Azure Image SLES15-SP4-CHOST-BYOS-EC2 Image SLES15-SP4-CHOST-BYOS-GCE Image SLES15-SP4-CHOST-BYOS-SAP-CCloud Image SLES15-SP4-HPC-BYOS Image SLES15-SP4-HPC-BYOS-Azure Image SLES15-SP4-HPC-BYOS-EC2 Image SLES15-SP4-HPC-BYOS-GCE Image SLES15-SP4-HPC-EC2 Image SLES15-SP4-HPC-GCE Image SLES15-SP4-Hardened-BYOS Image SLES15-SP4-Hardened-BYOS-Azure Image SLES15-SP4-Hardened-BYOS-EC2 Image SLES15-SP4-Hardened-BYOS-GCE Image SLES15-SP4-SAP-BYOS Image SLES15-SP4-SAP-BYOS-Azure Image SLES15-SP4-SAP-BYOS-EC2 Image SLES15-SP4-SAP-BYOS-GCE Image SLES15-SP4-SAP-Hardened Image SLES15-SP4-SAP-Hardened-Azure Image SLES15-SP4-SAP-Hardened-BYOS Image SLES15-SP4-SAP-Hardened-BYOS-Azure Image SLES15-SP4-SAP-Hardened-BYOS-EC2 Image SLES15-SP4-SAP-Hardened-BYOS-GCE Image SLES15-SP4-SAP-Hardened-GCE Image SLES15-SP5-BYOS-Azure Image SLES15-SP5-BYOS-EC2 Image SLES15-SP5-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-Aliyun Image SLES15-SP5-CHOST-BYOS-Azure Image SLES15-SP5-CHOST-BYOS-EC2 Image SLES15-SP5-CHOST-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-GDC Image SLES15-SP5-CHOST-BYOS-SAP-CCloud Image SLES15-SP5-EC2 Image SLES15-SP5-GCE Image SLES15-SP5-HPC-BYOS-Azure Image SLES15-SP5-HPC-BYOS-EC2 Image SLES15-SP5-HPC-BYOS-GCE Image SLES15-SP5-Hardened-BYOS-Azure Image SLES15-SP5-Hardened-BYOS-EC2 Image SLES15-SP5-Hardened-BYOS-GCE Image SLES15-SP5-SAP-Azure-3P Image SLES15-SP5-SAP-BYOS-Azure Image SLES15-SP5-SAP-BYOS-EC2 Image SLES15-SP5-SAP-BYOS-GCE Image SLES15-SP5-SAP-Hardened-Azure Image SLES15-SP5-SAP-Hardened-BYOS-Azure Image SLES15-SP5-SAP-Hardened-BYOS-EC2 Image SLES15-SP5-SAP-Hardened-BYOS-GCE Image SLES15-SP5-SAP-Hardened-GCE Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.172 Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.155 Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.168 Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.139 Container suse/sl-micro/6.0/toolbox:13.2-9.105 Image SL-Micro Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.102 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.127 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.116 Affected
Container suse/sl-micro/6.1/base-os-container:2.2.1-5.126 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected

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