USN-8932-1: curl vulnerabilities
Stanislav Fort discovered that curl did not properly clear AWS SigV4 authentication state when CURLOPTAWSSIGV4 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 CURLOPTCRLF 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 CURLINFOEFFECTIVEURL 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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
ubuntu/curlto a version that resolves this vulnerability.Fixed in 8.5.0-2ubuntu10.16 - Upgrade
Upgrade
ubuntu/libcurl3t64-gnutlsto a version that resolves this vulnerability.Fixed in 8.5.0-2ubuntu10.16 - Upgrade
Upgrade
ubuntu/libcurl4-gnutls-devto a version that resolves this vulnerability.Fixed in 8.5.0-2ubuntu10.16 - Upgrade
Upgrade
ubuntu/libcurl4-openssl-devto a version that resolves this vulnerability.Fixed in 8.5.0-2ubuntu10.16 - Upgrade
Upgrade
ubuntu/libcurl4t64to a version that resolves this vulnerability.Fixed in 8.5.0-2ubuntu10.16 - Upgrade
Upgrade
ubuntu/curlto a version that resolves this vulnerability.Fixed in 7.81.0-1ubuntu1.30 - Upgrade
Upgrade
ubuntu/libcurl3-gnutlsto a version that resolves this vulnerability.Fixed in 7.81.0-1ubuntu1.30 - Upgrade
Upgrade
ubuntu/libcurl3-nssto a version that resolves this vulnerability.Fixed in 7.81.0-1ubuntu1.30 - Upgrade
Upgrade
ubuntu/libcurl4to a version that resolves this vulnerability.Fixed in 7.81.0-1ubuntu1.30 - Upgrade
Upgrade
ubuntu/libcurl4-gnutls-devto a version that resolves this vulnerability.Fixed in 7.81.0-1ubuntu1.30 - Upgrade
Upgrade
ubuntu/libcurl4-nss-devto a version that resolves this vulnerability.Fixed in 7.81.0-1ubuntu1.30 - Upgrade
Upgrade
ubuntu/libcurl4-openssl-devto a version that resolves this vulnerability.Fixed in 7.81.0-1ubuntu1.30 - Upgrade
Upgrade
ubuntu/curlto a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/libcurl3-gnutlsto a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/libcurl3-nssto a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/libcurl4to a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/libcurl4-gnutls-devto a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/libcurl4-nss-devto a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/libcurl4-openssl-devto a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/libcurl3to a version that resolves this vulnerability.Fixed in Ubuntu Pro - Upgrade
Upgrade
ubuntu/curlto a version that resolves this vulnerability.Fixed in 7.35.0-1ubuntu2.20+esm24 - Upgrade
Upgrade
ubuntu/curlto a version that resolves this vulnerability.Fixed in 7.47.0-1ubuntu2.19+esm21 - Upgrade
Upgrade
ubuntu/curlto a version that resolves this vulnerability.Fixed in 7.58.0-2ubuntu3.24+esm15 - Upgrade
Upgrade
ubuntu/curlto a version that resolves this vulnerability.Fixed in 7.68.0-1ubuntu2.25+esm10 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch USN-8932-1
Event History
Child vulnerabilities
Contains the following vulnerabilities.
- CVE-2026-94266
- CVE-2026-92391
- CVE-2026-92389
- CVE-2026-92388
- CVE-2026-87864
- CVE-2026-87863
- CVE-2026-87862
- CVE-2026-86414
- CVE-2026-86409
- UBUNTU-CVE-2026-86409
- UBUNTU-CVE-2026-86414
- UBUNTU-CVE-2026-87862
- UBUNTU-CVE-2026-87863
- UBUNTU-CVE-2026-87864
- UBUNTU-CVE-2026-92388
- UBUNTU-CVE-2026-92389
- UBUNTU-CVE-2026-92391
- UBUNTU-CVE-2026-94266
Frequently Asked Questions
Which CVE records are covered by this advisory?
The advisory references CVE-2026-94266, CVE-2026-92391, and CVE-2026-92389.