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CVE-2026-8458 is a low-severity vulnerability in libcurl’s connection reuse logic for HTTP Negotiate-authenticated requests. libcurl maintains a pool of live connections and reuses them when reuse criteria are considered compatible. Due to a logical error, the reuse decision did not properly account for the configured Negotiate service name, allowing a new request to reuse an existing authenticated connection to the same server even when that connection had been established for a different service. The issue affects libcurl versions 7.43.0 through 8.20.0 inclusive and does not affect the curl command-line tool. The flaw is triggered in scenarios using service-specific Negotiate configuration through the relevant libcurl options for service naming.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A curl/libcurl vulnerability caused by incorrect connection reuse across different services.
A low-severity curl/libcurl vulnerability involving improper connection reuse across different services.
A low-severity libcurl vulnerability where a logical error can cause reuse of an existing Negotiate-authenticated connection for a different service on the same host, port, and credentials, potentially exposing data to the wrong session.
A curl vulnerability involving incorrect connection reuse across different services.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.