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CVE-2026-8926· NVD / CVE Program· CNA curl

password leak with netrc and user in URL

When asking curl to use a `.netrc` file to find credentials and at the same time specifying a URL with a username (without a password), like `https://user@example.com/`, curl could wrongly get and use the password for *another* user set in the `.netrc` file for that host if such a one exists and there is no match for the specified user.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
Jul 3, 2026
Updated
Sep 15, 2026
EPSS
0.4% · 36th percentile
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JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Affected systems

VendorProduct
haxxcurl

Affected versions

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

  • haxx curl8.11.1 and later · before 8.21.0

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

    • 8.20.0, 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, 8.11.1affected
    • 8.11.1 and later · before 8.14.2affected · semver
    • 8.15.0 and later · before 8.16.1affected · semver
    • 8.17.0 and later · before 8.20.1affected · semver
    • e9b9bbac22c26cf67316fa8e6c6b9e831af31949 and later · before 4ae1d7cc2643e4773a136395f12bc02fc6867854affected · 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_2.68.12.1-4.el10_2.6
AlmaLinux:10libcurlbefore 8.12.1-4.el10_2.68.12.1-4.el10_2.6
AlmaLinux:10libcurl-develbefore 8.12.1-4.el10_2.68.12.1-4.el10_2.6
AlmaLinux:10libcurl-minimalbefore 8.12.1-4.el10_2.68.12.1-4.el10_2.6
Alpine:v3.23curlfrom 8.11.1 · before 8.22.0-r08.22.0-r0
Alpine:v3.24curlfrom 8.11.1 · before 8.21.0-r08.21.0-r0
Debian:13curlall versions—
Debian:14curlbefore 8.21.0~rc2-18.21.0~rc2-1
openSUSE:Leap 16.0curlbefore 8.14.1-160000.9.18.14.1-160000.9.1
openSUSE:Tumbleweedcurlbefore 8.21.0-1.18.21.0-1.1
Red Hat:enterprise_linux_eus:10.0curlbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0curl-debuginfobefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0curl-debugsourcebefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurlbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-debuginfobefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-develbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-minimalbefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux_eus:10.0libcurl-minimal-debuginfobefore 0:8.12.1-1.el10_0.100:8.12.1-1.el10_0.10
Red Hat:enterprise_linux:10.2curlbefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2curl-debuginfobefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2curl-debugsourcebefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2libcurlbefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2libcurl-debuginfobefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6
Red Hat:enterprise_linux:10.2libcurl-develbefore 0:8.12.1-4.el10_2.60:8.12.1-4.el10_2.6

+14

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
    50Plan
  • 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
  • CVE-2019-5482Heap buffer overflow in the TFTP protocol handler in cURL 7.19.4 to 7.65.3.
    44Plan
  • CVE-2017-8817The FTP wildcard function in curl and libcurl before 7.57.0 allows remote attackers to cause a denial of service (out-of-bounds read and app
    42Plan
  • CVE-2017-8816The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer
    42Plan

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 curl4ae1d7cc2643e4773a136395f12bc02fc6867854Vendor (CNA)
curl curl8.14.2Vendor (CNA)
curl curl8.16.1Vendor (CNA)
curl curl8.20.1Vendor (CNA)
azl3 curl 8.11.1-9 on Azure Linux 3.08.11.1-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:curl8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl-devel8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
almalinux:libcurl-minimal8.12.1-4.el10_2.6 · AlmaLinux:10Package registry (OSV)
alpine:curl8.22.0-r0 · Alpine:v3.23Package registry (OSV)
debian:curl8.21.0~rc2-1 · Debian:14Package registry (OSV)
opensuse:curl8.21.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:cargo0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:curl0:8.21.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:curl-debuginfo0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:curl-debugsource0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-debuginfo0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-devel0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-minimal0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:libcurl-minimal-debuginfo0:8.12.1-4.el10_2.6 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:rust0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:rust-debugger-common0:1.96.1-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
rocky linux:curl0:8.12.1-4.el10_2.6 · Rocky Linux:10Package registry (OSV)
suse:curl8.14.1-slfo.1.1_9.1 · SUSE:Linux Micro 6.1Package registry (OSV)
suse:curl-mini8.14.1-160000.9.1 · 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-2026-90790 days apartstale proxy password leak
    39Monitor
  • CVE-2026-625351 days apartproxy credentials leak over redirect-to proxy
    23Monitor
  • CVE-2026-3783114 days aparttoken leak with redirect and netrc
    21Monitor
  • CVE-2025-14524176 days apartbearer token leak on cross-protocol redirect
    21Monitor

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

Weakness class (CWE)

CWE-522 · Insufficiently Protected Credentials

CVSS vector

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

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.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

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

References

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

All records