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QSN-8932-1: curl vulnerabilities

October 14, 2026

Summary

Several security issues were fixed in curl.

Details

Stanislav Fort discovered that curl did not properly clear AWS SigV4 authentication state when CURLOPT_AWS_SIGV4 was set to NULL. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-86409)

Stanislav Fort discovered that an HTTP proxy could trick libcurl into sending credentials to the proxy itself by responding to a CONNECT request with an unexpected authentication challenge. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-86414)

Stanislav Fort discovered that curl did not correctly handle HSTS entries when an includeSubDomains parent entry was imported before a longer-lived child entry. An attacker could possibly use this issue to cause curl to use unencrypted HTTP connections. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-87862)

Stanislav Fort discovered that curl did not properly handle HSTS max-age values that exceeded calendar time structure bounds. An attacker could possibly use this issue to cause a denial of service or data loss. This issue only affected Ubuntu 24.04 LTS. (CVE-2026-87863)

Stanislav Fort discovered that curl did not properly handle IMAP APPEND commands when CURLOPT_CRLF was enabled, allowing overflow bytes to be interpreted as pipelined commands. An authenticated attacker could possibly use this issue to inject arbitrary IMAP commands. (CVE-2026-87864)

Joshua Rogers discovered that libcurl had a use-after-free vulnerability in the FTP wildcard matching code. An attacker could possibly use this issue to cause curl to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-92388)

Joshua Rogers discovered that libcurl's TFTP state machine did not properly validate transfer directions, allowing a malicious server to force the client into transmit mode. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-92389)

Joshua Rogers discovered that curl had a stack overflow vulnerability when processing deeply nested MIME structures. An attacker could possibly use this issue to cause curl to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-92391)

Joshua Rogers discovered that libcurl could expose credentials in the URL returned by CURLINFO_EFFECTIVE_URL when credentials were retrieved from a .netrc file. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-94266)

Affected QuantaStor releases

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.307.81.0-1ubuntu1.30Fixed in this release
6.9.1.001Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.307.81.0-1ubuntu1.30Fixed in this release
6.9.1.001Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.307.81.0-1ubuntu1.30Fixed in this release
6.9.0.464Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.307.81.0-1ubuntu1.30Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.307.81.0-1ubuntu1.30Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.307.81.0-1ubuntu1.30Fixed in this release
6.8.6.015Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.277.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.277.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.277.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTScurlInternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibcurl3-gnutlsExternally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibcurl4Internally-facing7.81.0-1ubuntu1.257.81.0-1ubuntu1.30Fixed by QuantaStor security update

Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.

CVEs

CVE-2026-92388, CVE-2026-92389, CVE-2026-87864, CVE-2026-87862, CVE-2026-94266, CVE-2026-87863, CVE-2026-92391, CVE-2026-86414, CVE-2026-86409

References

https://ubuntu.com/security/notices/USN-8932-1

https://nvd.nist.gov/vuln/detail/CVE-2026-92388

https://nvd.nist.gov/vuln/detail/CVE-2026-92389

https://nvd.nist.gov/vuln/detail/CVE-2026-87864

https://nvd.nist.gov/vuln/detail/CVE-2026-87862

https://nvd.nist.gov/vuln/detail/CVE-2026-94266

https://nvd.nist.gov/vuln/detail/CVE-2026-87863

https://nvd.nist.gov/vuln/detail/CVE-2026-92391

https://nvd.nist.gov/vuln/detail/CVE-2026-86414

https://nvd.nist.gov/vuln/detail/CVE-2026-86409

Update

Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:

PlatformPackageVersion
bioniccurl7.58.0-2ubuntu3.24+esm15
Ubuntu 20.04 LTScurl7.68.0-1ubuntu2.25+esm10
Ubuntu 22.04 LTScurl7.81.0-1ubuntu1.30
Ubuntu 24.04 LTScurl8.5.0-2ubuntu10.16
trustycurl7.35.0-1ubuntu2.20+esm24
xenialcurl7.47.0-1ubuntu2.19+esm21