CVE-2026-8925Public exploitNetwork attack vector

Client memory corruption via GSASL context double-free

Published Jul 3, 2026 · Updated Jul 3, 2026

Double free in GSASL authentication in curl 8.15.0 through 8.20.0 allows remote attackers to corrupt client memory via a SASL server. Curl_auth_gsasl_is_supported calls gsasl_done after gsasl_client_start fails but leaves gsasl->ctx non-NULL, so later cleanup frees the same context again. The path requires curl built with libgsasl and an IMAP, POP3, or SMTP exchange whose server behavior influences the failing authentication sequence; the vendor states that controlling the second free's target is difficult.

CVSS severity9.8
Critical
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in GSASL authentication in curl 8.15.0 through 8.20.0 allows remote attackers to corrupt client memory via a SASL server. Curl_auth_gsasl_is_supported calls gsasl_done after gsasl_client_start fails but leaves gsasl->ctx non-NULL, so later cleanup frees the same context again. The path requires curl built with libgsasl and an IMAP, POP3, or SMTP exchange whose server behavior influences the failing authentication sequence; the vendor states that controlling the second free's target is difficult.

The record

CVE
CVE-2026-8925
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
curl
Product
curl
Classifications
CWE-415, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.15.0 <=8.15.0
  2. Affected versionversion=8.16.0 <=8.16.0
  3. Affected versionversion=8.17.0 <=8.17.0
  4. Affected versionversion=8.18.0 <=8.18.0
  5. Affected versionversion=8.19.0 <=8.19.0
  6. Affected versionversion=8.20.0 <=8.20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=8.15.0 <=8.15.0; version=8.16.0 <=8.16.0; version=8.17.0 <=8.17.0; version=8.18.0 <=8.18.0; version=8.19.0 <=8.19.0; version=8.20.0 <=8.20.0

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-415Double Free
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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