# CVE-2022-42915: curl: curl before 7.86.0 has a double free

CVE-2022-42915 is fixed in 13 products on 1 platform, first by curl 7.81.0-1ubuntu1.6, released October 26, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-42915
- Priority: High
- CVSS: 8.1 (high)
- EPSS: 0.0365
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 26, 2022

## Description

curl before 7.86.0 has a double free. If curl is told to use an HTTP proxy for a transfer with a non-HTTP(S) URL, it sets up the connection to the remote server by issuing a CONNECT request to the proxy, and then tunnels the rest of the protocol through. An HTTP proxy might refuse this request (HTTP proxies often only allow outgoing connections to specific port numbers, like 443 for HTTPS) and instead return a non-200 status code to the client. Due to flaws in the error/cleanup handling, this could trigger a double free in curl if one of the following schemes were used in the URL for the transfer: dict, gopher, gophers, ldap, ldaps, rtmp, rtmps, or telnet. The earliest affected version is 7.77.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | curl Debian 12.15 (bookworm) | 7.86.0-1 | [DEBIAN-CVE-2022-42915](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42915.md) | Oct 29, 2022 |
| Linux | curl Debian 13.5 (trixie) | 7.86.0-1 | [DEBIAN-CVE-2022-42915](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42915.md) | Oct 29, 2022 |
| Linux | curl Debian 14 | 7.86.0-1 | [DEBIAN-CVE-2022-42915](https://patchblox.com/security/data/fix/linux/debian-cve-2022-42915.md) | Oct 29, 2022 |
| Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | [curl 7.81.0-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.6.md) | Oct 26, 2022 |
| Linux | curl amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl-debugsource amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl-minimal amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | curl-minimal-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl-devel amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl-minimal amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl-minimal-debuginfo amzn 2023 | 7.87.0-2.amzn2023.0.2 | [ALAS2023-2023-083](https://patchblox.com/security/data/fix/linux/alas2023-2023-083.md) | Feb 17, 2023 |
| Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | [libcurl3-gnutls 7.81.0-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.6.md) | Oct 26, 2022 |
| Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | [libcurl3-nss 7.81.0-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.6.md) | Oct 26, 2022 |
| Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.6 | [libcurl4 7.81.0-1ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.6.md) | Oct 26, 2022 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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