# Haxx Libcurl vulnerabilities

Source: https://junglewise.ai/threats/technologies/libcurl  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/libcurl.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 21 vulnerabilities in Haxx Libcurl: 0 in the last 7 days and 2 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-82208, was published on 6 September 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 2
- All time: 21 (2 critical, 0 exploited in the wild)

## About Haxx Libcurl

Command-line tool and library for transferring data using URLs with support for multiple protocols.

## Latest Haxx Libcurl vulnerabilities

- [CVE-2026-82208: curl libcurl certificate validation bypass in wolfSSL backend](https://junglewise.ai/threats/cve-2026-82208-curl-libcurl-certificate-validation-bypass-in-wolfssl-backend) (high, CVSS 7.5, published 6 Sep 2026)
- [CVE-2026-18924: curl libcurl HTTP/2 server push use-after-free](https://junglewise.ai/threats/cve-2026-18924-curl-libcurl-http-2-server-push-use-after-free) (critical, CVSS 9.1, published 6 Sep 2026)
- [CVE-2026-8932: curl libcurl authentication bypass via improper mTLS connection reuse](https://junglewise.ai/threats/cve-2026-8932-curl-libcurl-authentication-bypass-via-improper-mtls-connection) (info, published 3 Jul 2026)
- [CVE-2026-8927: curl libcurl authentication state leak in proxy handle reuse](https://junglewise.ai/threats/cve-2026-8927-curl-libcurl-authentication-state-leak-in-proxy-handle-reuse) (info, published 3 Jul 2026)
- [CVE-2026-8926: curl password leak in .netrc credential lookup](https://junglewise.ai/threats/cve-2026-8926-curl-password-leak-in-netrc-credential-lookup) (info, published 3 Jul 2026)
- [CVE-2026-8924: curl cookie parsing bypass via trailing dot hostname](https://junglewise.ai/threats/cve-2026-8924-curl-cookie-parsing-bypass-via-trailing-dot-hostname) (info, CVSS 0, published 3 Jul 2026)
- [CVE-2026-8458: curl libcurl incorrect connection reuse for Negotiate services](https://junglewise.ai/threats/cve-2026-8458-curl-libcurl-incorrect-connection-reuse-for-negotiate-services) (info, CVSS 0, published 3 Jul 2026)
- [CVE-2026-8286: curl wrong STARTTLS connection reuse](https://junglewise.ai/threats/cve-2026-8286-curl-wrong-starttls-connection-reuse) (info, published 3 Jul 2026)
- [CVE-2026-11352: curl QUIC infinite loop in UDP receive function](https://junglewise.ai/threats/cve-2026-11352-curl-quic-infinite-loop-in-udp-receive-function) (info, CVSS 0, published 3 Jul 2026)
- [CVE-2026-10536: curl libcurl use-after-free in HTTP/2 stream-dependency tree](https://junglewise.ai/threats/cve-2026-10536-curl-libcurl-use-after-free-in-http-2-stream-dependency-tree) (info, CVSS 3.3, published 3 Jul 2026)
- [CVE-2026-7168: Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and…](https://junglewise.ai/threats/cve-2026-7168-curl-libcurl-digest-auth-state-leak-when-changing-proxies) (medium, CVSS 5.3, published 13 May 2026)
- [CVE-2026-7009: curl OCSP stapling bypass when using Apple SecTrust](https://junglewise.ai/threats/cve-2026-7009-curl-ocsp-stapling-bypass-when-using-apple-sectrust) (medium, CVSS 5.3, published 13 May 2026)
- [CVE-2026-6429: When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl could leak the password…](https://junglewise.ai/threats/cve-2026-6429-curl-libcurl-netrc-credential-leak-in-redirected-proxy-connections) (medium, CVSS 5.3, published 13 May 2026)
- [CVE-2026-6276: Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done…](https://junglewise.ai/threats/cve-2026-6276-curl-libcurl-cookie-leak-via-stale-custom-host-header) (high, CVSS 7.5, published 13 May 2026)
- [CVE-2026-6253: curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following…](https://junglewise.ai/threats/cve-2026-6253-curl-proxy-credentials-leak-during-redirect-to-different-proxy) (medium, CVSS 5.9, published 13 May 2026)
- [CVE-2026-5545: libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after…](https://junglewise.ai/threats/cve-2026-5545-curl-incorrect-connection-reuse-in-negotiate-authentication) (medium, CVSS 6.5, published 13 May 2026)
- [CVE-2026-4873: A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same…](https://junglewise.ai/threats/cve-2026-4873-curl-connection-reuse-ignores-tls-requirement-in-email-protocols) (medium, CVSS 5.9, published 13 May 2026)
- [CVE-2025-14819: curl libcurl certificate validation bypass in OpenSSL backend](https://junglewise.ai/threats/cve-2025-14819-curl-libcurl-certificate-validation-bypass-in-openssl-backend) (medium, CVSS 5.3, published 8 Jan 2026)
- [CVE-2025-9086: curl out-of-bounds read in cookie path comparison](https://junglewise.ai/threats/cve-2025-9086-curl-out-of-bounds-read-in-cookie-path-comparison) (high, CVSS 7.5, published 12 Sep 2025)
- [CVE-2023-38546: curl libcurl cookie injection via curl_easy_duphandle](https://junglewise.ai/threats/cve-2023-38546-curl-libcurl-cookie-injection-via-curl-easy-duphandle) (low, CVSS 3.7, published 18 Oct 2023)
- [CVE-2023-38545: curl SOCKS5 heap buffer overflow during handshake](https://junglewise.ai/threats/cve-2023-38545-curl-socks5-heap-buffer-overflow-during-handshake) (critical, CVSS 9.8, published 18 Oct 2023)

## Most severe Haxx Libcurl vulnerabilities

- [CVE-2023-38545: curl SOCKS5 heap buffer overflow during handshake](https://junglewise.ai/threats/cve-2023-38545-curl-socks5-heap-buffer-overflow-during-handshake) (critical, CVSS 9.8, published 18 Oct 2023)
- [CVE-2026-18924: curl libcurl HTTP/2 server push use-after-free](https://junglewise.ai/threats/cve-2026-18924-curl-libcurl-http-2-server-push-use-after-free) (critical, CVSS 9.1, published 6 Sep 2026)
- [CVE-2026-82208: curl libcurl certificate validation bypass in wolfSSL backend](https://junglewise.ai/threats/cve-2026-82208-curl-libcurl-certificate-validation-bypass-in-wolfssl-backend) (high, CVSS 7.5, published 6 Sep 2026)
- [CVE-2026-6276: Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done…](https://junglewise.ai/threats/cve-2026-6276-curl-libcurl-cookie-leak-via-stale-custom-host-header) (high, CVSS 7.5, published 13 May 2026)
- [CVE-2025-9086: curl out-of-bounds read in cookie path comparison](https://junglewise.ai/threats/cve-2025-9086-curl-out-of-bounds-read-in-cookie-path-comparison) (high, CVSS 7.5, published 12 Sep 2025)
- [CVE-2026-5545: libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTP(S) request after…](https://junglewise.ai/threats/cve-2026-5545-curl-incorrect-connection-reuse-in-negotiate-authentication) (medium, CVSS 6.5, published 13 May 2026)
- [CVE-2026-6253: curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following…](https://junglewise.ai/threats/cve-2026-6253-curl-proxy-credentials-leak-during-redirect-to-different-proxy) (medium, CVSS 5.9, published 13 May 2026)
- [CVE-2026-4873: A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same…](https://junglewise.ai/threats/cve-2026-4873-curl-connection-reuse-ignores-tls-requirement-in-email-protocols) (medium, CVSS 5.9, published 13 May 2026)
- [CVE-2025-14819: curl libcurl certificate validation bypass in OpenSSL backend](https://junglewise.ai/threats/cve-2025-14819-curl-libcurl-certificate-validation-bypass-in-openssl-backend) (medium, CVSS 5.3, published 8 Jan 2026)
- [CVE-2026-7168: Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and…](https://junglewise.ai/threats/cve-2026-7168-curl-libcurl-digest-auth-state-leak-when-changing-proxies) (medium, CVSS 5.3, published 13 May 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 2 | 1 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Haxx technologies

- [Haxx Curl](https://junglewise.ai/threats/technologies/curl): 43 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Haxx Libcurl vulnerabilities", https://junglewise.ai/threats/technologies/libcurl, 9 November 2026.