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curl CVE-2026-8925

| EUVDEUVD-2026-41506 CRITICAL
Double Free (CWE-415)
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
Red Hat
8.1 HIGH
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
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. No public exploit identified at time of analysis, and the EPSS score is low (0.25%, 16th percentile) despite the headline CVSS of 9.8.

Technical ContextAI

curl uses the SASL framework to negotiate authentication for protocols such as SMTP, IMAP, POP3 and LDAP. When compiled against libgsasl (the GNU SASL library), curl allocates a GSASL context to drive mechanisms like SCRAM. The bug is a classic double-free (CWE-415, not populated in the input): a cleanup routine releases the GSASL context but leaves the dangling pointer in place, and a second cleanup path frees the identical pointer again. Double-frees can corrupt allocator metadata, and depending on heap state and allocator hardening may cause a crash or, in the worst theoretical case, controlled memory corruption. This code path only exists in builds configured with GSASL; curl builds without libgsasl are unaffected.

RemediationAI

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. Apply your distribution's update (for Ubuntu, USN-8487-1 at https://ubuntu.com/security/notices/USN-8487-1). As a compensating control until patched, rebuild or deploy a curl configured without GSASL support (--without-gsasl), which removes the vulnerable code path at the cost of losing GSASL-provided SASL mechanisms such as SCRAM; alternatively, avoid using curl/libcurl to authenticate against untrusted SMTP/IMAP/POP3 servers and restrict outbound connections to known-good mail/auth endpoints, accepting the operational limitation that this blocks connections to arbitrary servers. Rebuild any statically-linked applications that bundle libcurl after upgrading.

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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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