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Noroxi
NVD / CVE Program· CNA curl

CVE-2026-6429: netrc credential leak with reused proxy connection

Noroxi assessment

Priority: Monitor (action score 21/100)

  • 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: 0.51% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: curl curl 8.14.2, 8.16.1, 8.20.0; azl3 cmake 3.30.3-13 on Azure Linux 3.0 3.30.3-14; azl3 curl 8.11.1-7 on Azure Linux 3.0 8.11.1-8.

Low priority for now. Upgrade to curl curl 8.14.2, 8.16.1, 8.20.0; azl3 cmake 3.30.3-13 on Azure Linux 3.0 3.30.3-14; azl3 curl 8.11.1-7 on Azure Linux 3.0 8.11.1-8 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

When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
May 13, 2026
Updated
Sep 15, 2026
EPSS
0.5% · 43th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
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-2026-6429

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.

VendorProduct
haxxcurl

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • haxx curl7.14.0 and later · before 8.20.0

Versions reported by the vendor

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

  • curl curl

    • 8.19.0, 8.18.0, 8.17.0, 8.16.0, 8.15.0, 8.14.1, 8.14.0, 8.13.0, 8.12.1, 8.12.0, 8.11.1, 8.11.0 … (+24)affected
    • 7.14.0 and later · before 8.14.2affected · semver
    • 8.15.0 and later · before 8.16.1affected · semver
    • 8.17.0 and later · before 8.20.0affected · semver
    • 01165e08e0d131b399fba2190f17af67e66f0888 and later · before b4024bf808bd558026fdc6096e8457f199ace306affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10curlbefore 8.12.1-4.el10_2.78.12.1-4.el10_2.7
AlmaLinux:10libcurlbefore 8.12.1-4.el10_2.78.12.1-4.el10_2.7
AlmaLinux:10libcurl-develbefore 8.12.1-4.el10_2.78.12.1-4.el10_2.7
AlmaLinux:10libcurl-minimalbefore 8.12.1-4.el10_2.78.12.1-4.el10_2.7
Alpine:v3.21curlfrom 7.14.0 · before 8.14.1-r38.14.1-r3
Alpine:v3.22curlfrom 7.14.0 · before 8.14.1-r48.14.1-r4
Alpine:v3.23curlfrom 7.14.0 · before 8.20.0-r08.20.0-r0
Debian:12curlfrom 0—
Debian:13curlbefore 8.14.1-2+deb13u48.14.1-2+deb13u4
Debian:14curlbefore 8.20.0~rc3-18.20.0~rc3-1
openSUSE:Leap 16.0curlbefore 8.14.1-160000.6.18.14.1-160000.6.1
openSUSE:Tumbleweedcurlbefore 8.20.0-1.18.20.0-1.1
Red Hat:enterprise_linux:10.2curlbefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:enterprise_linux:10.2curl-debuginfobefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:enterprise_linux:10.2curl-debugsourcebefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:enterprise_linux:10.2libcurlbefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:enterprise_linux:10.2libcurl-debuginfobefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:enterprise_linux:10.2libcurl-develbefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:enterprise_linux:10.2libcurl-minimalbefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:enterprise_linux:10.2libcurl-minimal-debuginfobefore 0:8.12.1-4.el10_2.70:8.12.1-4.el10_2.7
Red Hat:hummingbird:1curlbefore 0:8.20.0-0.1.hum10:8.20.0-0.1.hum1
Red Hat:hummingbird:1libcurlbefore 0:8.20.0-0.1.hum10:8.20.0-0.1.hum1
Red Hat:hummingbird:1libcurl-develbefore 0:8.20.0-0.1.hum10:8.20.0-0.1.hum1
Red Hat:hummingbird:1libcurl-minimalbefore 0:8.20.0-0.1.hum10:8.20.0-0.1.hum1

+5

Same product

haxx: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-22901curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session t
    51Plan
  • CVE-2023-38039When curl retrieves an HTTP response, it stores the incoming headers so that they can be accessed later via the libcurl headers API.
    47Plan
  • CVE-2024-2398HTTP/2 push headers memory-leak
    45Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-6253May 13, 2026 · proxy credentials leak over redirect-to proxy
    23Monitor
  • ← EarlierCVE-2026-6276May 13, 2026 · stale custom cookie host causes cookie leak
    30Monitor
  • Later →CVE-2026-7009May 13, 2026 · OCSP stapling bypass with Apple SecTrust
    21Monitor

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
curl curl8.14.2Vendor (CNA)
curl curl8.16.1Vendor (CNA)
curl curl8.20.0Vendor (CNA)
curl curlb4024bf808bd558026fdc6096e8457f199ace306Vendor (CNA)
azl3 cmake 3.30.3-13 on Azure Linux 3.03.30.3-14 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 curl 8.11.1-7 on Azure Linux 3.08.11.1-8 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:curl8.12.1-4.el10_2.7 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl8.12.1-4.el10_2.7 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl-devel8.12.1-4.el10_2.7 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl-minimal8.12.1-4.el10_2.7 · AlmaLinux:10Package registry (OSV)
alpine:curl8.14.1-r3 · Alpine:v3.21Package registry (OSV)
alpine:curl8.20.0-r0 · Alpine:v3.23Package registry (OSV)
debian:curl8.14.1-2+deb13u4 · Debian:13Package registry (OSV)
opensuse:curl8.20.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:curl0:8.20.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:curl-debuginfo0:8.12.1-4.el10_2.7 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:curl-debugsource0:8.12.1-4.el10_2.7 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl0:8.20.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-debuginfo0:8.12.1-4.el10_2.7 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-devel0:8.20.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-minimal0:8.20.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libcurl-minimal-debuginfo0:8.12.1-4.el10_2.7 · Red Hat:enterprise_linux:10.2Package registry (OSV)
rocky linux:curl0:8.12.1-4.el10_2.7 · Rocky Linux:10Package registry (OSV)
suse:curl8.14.1-160000.6.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:curl-mini8.14.1-160000.6.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

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.

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.

  • CVE-2026-954551 days apartexposing HTTP/3 early data
    30Monitor
  • CVE-2026-954651 days apartA vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly cleared.
    30Monitor
  • CVE-2024-11053518 days apartnetrc and redirect credential leak
    14Monitor
  • CVE-2025-0167462 days apartnetrc and default credential leak
    13Monitor

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.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

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

nvd-secondary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

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

Change log

  1. Fix✗ → ✓

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

References

Show all references (1 more)

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

All records