CVE & CISA-KEV Catalog

CVE-2026-8458

UNSCORED
NVD

Description

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different 'services'. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.

How to fix

Remediation Available
curlDebian
Fixed in:8.21.0~rc2-1CVE-2026-8458
curlUbuntu
Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1
Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1
Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1
Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1
Fixed in:7.81.0-1ubuntu1.25USN-8487-1
Fixed in:8.5.0-2ubuntu10.10USN-8487-1
Fixed in:8.14.1-2ubuntu1.4USN-8487-1
libcurl3Ubuntu
Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1
Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1
libcurl3-gnutlsUbuntu
Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1
Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1
Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1
Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1
Fixed in:7.81.0-1ubuntu1.25USN-8487-1
libcurl3-nssUbuntu
Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1
Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1
Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1
Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1
Fixed in:7.81.0-1ubuntu1.25USN-8487-1
libcurl3t64-gnutlsUbuntu
Fixed in:8.5.0-2ubuntu10.10USN-8487-1
Fixed in:8.14.1-2ubuntu1.4USN-8487-1
libcurl4Ubuntu
Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1
Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1
Fixed in:7.81.0-1ubuntu1.25USN-8487-1
libcurl4-gnutls-devUbuntu
Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1
Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1
Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1
Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1
Fixed in:7.81.0-1ubuntu1.25USN-8487-1
Fixed in:8.5.0-2ubuntu10.10USN-8487-1
Fixed in:8.14.1-2ubuntu1.4USN-8487-1
libcurl4-nss-devUbuntu
Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1
Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1
Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1
Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1
Fixed in:7.81.0-1ubuntu1.25USN-8487-1
libcurl4-openssl-devUbuntu
Fixed in:7.35.0-1ubuntu2.20+esm20USN-8487-1
Fixed in:7.47.0-1ubuntu2.19+esm16USN-8487-1
Fixed in:7.58.0-2ubuntu3.24+esm9USN-8487-1
Fixed in:7.68.0-1ubuntu2.25+esm4USN-8487-1
Fixed in:7.81.0-1ubuntu1.25USN-8487-1
Fixed in:8.5.0-2ubuntu10.10USN-8487-1
Fixed in:8.14.1-2ubuntu1.4USN-8487-1
libcurl4t64Ubuntu
Fixed in:8.5.0-2ubuntu10.10USN-8487-1
Fixed in:8.14.1-2ubuntu1.4USN-8487-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3.1 Vector

No CVSS vector data available.

Exploit Intelligence

0.21%probability of exploitation in 30 days
11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-03.