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curl CVE-2026-8925

| EUVDEUVD-2026-41506 CRITICAL
Double Free (CWE-415)
2026-06-24 GHSA-p8x5-c6c9-8cwx
Information Disclosure Curl
Critical
Disputed · 9.8 Vendor
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Severity by source

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

Reachable only in GSASL builds via an attacker-controlled SASL server (AC:H); most realistic impact is a crash (A:H) with possible limited corruption (I:L), no direct info leak (C:N).

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

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Jul 06, 2026 - 18:34 vuln.today
v3 (cvss_changed)
Analysis Updated
Jul 06, 2026 - 18:34 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
9.8 (CRITICAL)
Analysis Generated
Jun 24, 2026 - 18:29 vuln.today

Description PRE-NVD

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

AnalysisAI

Memory-safety defect (double-free) in curl's SASL authentication path affects versions 8.15.0 through 8.20.0 when built with GSASL support: the GSASL context is cleaned up twice without the intervening pointer being cleared, causing the same allocation to be free()'d twice. A malicious or malfunctioning mail/auth server exercising the SASL handshake could trigger the condition, potentially corrupting heap memory and at minimum crashing the client. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure client to malicious SASL server
Delivery
Initiate SMTP/IMAP SASL auth
Exploit
Server steers GSASL cleanup path
Execution
Trigger double-free of context
Impact
Corrupt heap / crash client
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Vulnerability AssessmentAI

Exploitation Exploitation requires curl/libcurl to be compiled with GSASL support and to be driven through a SASL authentication exchange (e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals conflict sharply. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An application uses libcurl (built with GSASL) to fetch mail from or authenticate to a server the attacker controls or can redirect to. During the SASL authentication exchange, the server responds in a way that drives curl through the flawed cleanup path, freeing the GSASL context twice and corrupting the heap - crashing the client or, under favorable allocator conditions, enabling further memory-corruption exploitation. …
Remediation Patch available per vendor advisory: upgrade curl/libcurl to the fixed release published by the curl project - consult https://curl.se/docs/CVE-2026-8925.html for the exact patched version, as a specific fix version is not enumerated in the input and should not be invented. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems running curl 8.15.0-8.20.0 with GSASL support enabled (verify via curl --version | grep GSASL). …

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Same weakness CWE-415 – Double Free

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Not-Affected
SLES15-SP6-CHOST-BYOS Not-Affected
SLES15-SP6-CHOST-BYOS-Aliyun Not-Affected
SLES15-SP6-CHOST-BYOS-Azure Not-Affected
SLES15-SP6-CHOST-BYOS-EC2 Not-Affected

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CVE-2026-8925 vulnerability details – vuln.today
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