libcurl

A concurrency flaw in libcurl’s HSTS sharing code can cause a double-free or use-after-free when two threads share the same HSTS storage, producing crashes and availability failures for affected applications; the bug was disclosed as CVE-2023-27537 and addressed by the curl project and...

A subtle connection-reuse bug in libcurl—tracked as CVE-2023-27536—exposed a real-world risk that the library could accidentally reuse an authenticated connection with higher GSSAPI/Kerberos delegation permissions for a subsequent transfer that should have been performed with lower permissions...

The short answer is: Microsoft’s MSRC advisory naming Azure Linux as a carrier of the vulnerable libcurl component is an authoritative, product‑scoped attestation — but it is not a technical guarantee that Azure Linux is the only Microsoft product that could include libcurl and therefore be...

The macidn/punycode bug tracked as CVE-2024-6874 is real, but the short answer to the question is: Microsoft’s public attestation names Azure Linux as the product that includes the affected upstream component, but that attestation is an inventory statement — not proof that no other Microsoft...

A subtle bug in libcurl’s handle-duplication logic can let an attacker plant cookies into a running process under a narrow set of conditions — a reliability bug that turned into a security issue and was assigned CVE‑2023‑38546. The flaw is small in scope, rated low severity by the curl project...

The curl project’s advisory for CVE-2024-2398 describes a straightforward but consequential bug: when an application enables HTTP/2 server push, libcurl can leak previously allocated header memory if a pushed stream exceeds the library’s header limit and is aborted — a leak that can amount to...

The recently assigned CVE-2025-10148 — a predictable WebSocket mask bug in curl/libcurl — is real, it is patched upstream, and Microsoft’s short public attestation that “Azure Linux includes this open‑source library and is therefore potentially affected” is accurate for the product it covers...

A silent boundary-check mistake in a widely used networking library has resurfaced a familiar security lesson: small parsing errors in C can still bite large ecosystems. In September 2025 the curl project disclosed CVE-2025-9086, an out-of-bounds read in cookie path handling inside libcurl that...