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curl CVE-2026-8926

| EUVDEUVD-2026-41507 CRITICAL
Insufficiently Protected Credentials (CWE-522)
Critical
Disputed · 9.1 Vendor
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Severity by source

Sources disagree (Medium–Critical)
Vendor (CNA) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
5.9 MEDIUM

AC:H because it needs a specific .netrc-plus-bare-username mismatch; PR:N/UI:N as no target auth is needed; C:H for credential leak; I:N and A:N since no data is altered or blocked.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Red Hat
4.8 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor

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

Lifecycle Timeline

5
Analysis Updated
Jul 06, 2026 - 18:28 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 06, 2026 - 18:22 vuln.today
cvss_changed
CVSS changed
Jul 06, 2026 - 18:22 NVD
9.1 (CRITICAL)
Analysis Generated
Jun 24, 2026 - 18:28 vuln.today

Description PRE-NVD

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

AnalysisAI

Credential disclosure in curl 8.11.1 through 8.20.0 (and earlier) lets curl silently substitute the wrong password when .netrc lookup is combined with a URL that carries a username but no password, such as https://user@example.com/. When no matching entry exists for the specified user, curl falls back to a different user's password stored for that same host and transmits it during authentication, potentially leaking one user's secret to a server or to an unintended account. Publicly available exploit-flow details exist via the originating HackerOne report; EPSS is low (0.20%, 9th percentile) and it is not in CISA KEV.

Technical ContextAI

The flaw lives in curl's .netrc credential-resolution logic (the netrc parser used by libcurl and the curl command-line tool). A .netrc file maps machine/login/password triples per host; when a URL supplies a username without a password, curl is supposed to find the password for that exact login. The bug is a matching failure: instead of requiring the login to match, curl accepts an unrelated password entry for the same host when the requested user is absent. The root-cause class is CWE-287/CWE-522-style credential mismanagement (use of wrong/incorrect credentials); NVD lists CWE as N/A. This is a logic error in credential selection rather than a memory-safety issue.

RemediationAI

Patch available per vendor advisory: upgrade to the fixed curl/libcurl release listed at https://curl.se/docs/CVE-2026-8926.html and apply distribution updates such as Ubuntu USN-8487-1 (https://ubuntu.com/security/notices/USN-8487-1); the exact fixed version number was not present in the supplied data, so confirm it against the curl advisory before deployment rather than assuming a version. As an immediate compensating control, avoid combining --netrc/--netrc-optional with URLs that embed a username but no password - either specify the full user:password explicitly, or ensure .netrc contains a matching login entry for every username you pass so no silent fallback can occur; the trade-off is added credential-management overhead in scripts. Where feasible, scope .netrc to a single login per host or use per-host credential files to eliminate the mismatched-entry condition entirely.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
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SLES15-SP6-CHOST-BYOS-Azure Affected
SLES15-SP6-CHOST-BYOS-EC2 Affected

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CVE-2026-8926 vulnerability details – vuln.today

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