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curl CVE-2026-8924

| EUVDEUVD-2026-41505 CRITICAL
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
7.2 HIGH

Malicious server needs no auth (PR:N, AC:L); cookies cross into other origins so S:C; impact is limited cookie mis-scoping, not full compromise, hence C:L/I:L and A:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
SUSE
8.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Red Hat
6.5 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 - 18:32 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:32 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 - 18:25 vuln.today

Description PRE-NVD

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

AnalysisAI

Cross-domain cookie injection in curl (versions 7.46.0 through 8.20.0) lets a malicious or compromised HTTP server set 'super cookies' that bypass the Public Suffix List (PSL) safeguard, causing curl to scope attacker-supplied cookies to unrelated third-party domains and transmit them on later requests. Rated CVSS 9.1 and tagged as an authentication bypass, the flaw undermines cookie origin isolation, but EPSS is low at 0.22% (12th percentile), there is no CISA KEV listing, and no public exploit was identified at time of analysis. A patched release is available from the curl project.

Technical ContextAI

curl's cookie engine enforces the Public Suffix List to prevent a server from setting a cookie for a broad domain suffix (e.g. '.co.uk' or '.com') that would then be shared across every site under it - the classic 'super cookie' problem. The vulnerability is a logic flaw in the domain-matching path of curl's cookie parser that fails to reject certain domain values against the PSL, so cookies that should be discarded are instead accepted and scoped to a wider domain than the origin is entitled to. Because CWE is listed as N/A, the most fitting root-cause class is improper cross-domain/origin restriction of cookie handling (CWE-923-style improper restriction of communications channel, related to CWE-565 reliance on untrusted cookie data). Per the EUVD CPE/version data the defect is present across the libcurl/curl cookie code from 7.46.0 up to and including 8.20.0, affecting both the curl CLI and any application linking libcurl with cookie handling enabled.

RemediationAI

Patch available per vendor advisory - upgrade curl/libcurl to the fixed release published by the curl project at https://curl.se/docs/CVE-2026-8924.html; an exact fixed version string was not provided in the input, so confirm the target version directly from that advisory (the affected range extends through 8.20.0, so the fix is a later release). On Linux distributions, apply the packaged update, e.g. via Ubuntu USN-8487-1 (https://ubuntu.com/security/notices/USN-8487-1) and equivalent vendor packages, and rebuild or restart any long-running services that statically or dynamically link libcurl. If immediate patching is not possible, the practical compensating control is to disable curl's cookie engine for untrusted fetches - do not pass -b/--cookie or -c/--cookie-jar and avoid loading a shared cookie file across origins - which prevents the mis-scoping entirely at the cost of losing cookie-based session handling; alternatively, isolate cookie jars per-origin and avoid reusing a single jar across mixed trust domains. Restrict curl usage to trusted endpoints where feasible, since exploitation requires connecting to a malicious server.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Affected
SLES15-SP6-CHOST-BYOS Affected
SLES15-SP6-CHOST-BYOS-Aliyun Affected
SLES15-SP6-CHOST-BYOS-Azure Affected
SLES15-SP6-CHOST-BYOS-EC2 Affected

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CVE-2026-8924 vulnerability details – vuln.today

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