# CVE-2023-23915: curl: A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functio...

CVE-2023-23915 is fixed in 13 products on 1 platform, first by curl 7.81.0-1ubuntu1.8, released February 14, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-23915
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0088
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 14, 2023

## Description

A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality to behave incorrectly when multiple URLs are requested in parallel. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. This HSTS mechanism would however surprisingly fail when multiple transfers are done in parallel as the HSTS cache file gets overwritten by the most recentlycompleted transfer. A later HTTP-only transfer to the earlier host name would then *not* get upgraded properly to HSTS.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | curl Debian 12.15 (bookworm) | 7.88.1-1 | [DEBIAN-CVE-2023-23915](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23915.md) | Feb 23, 2023 |
| Linux | curl Debian 13.5 (trixie) | 7.88.1-1 | [DEBIAN-CVE-2023-23915](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23915.md) | Feb 23, 2023 |
| Linux | curl Debian 14 | 7.88.1-1 | [DEBIAN-CVE-2023-23915](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23915.md) | Feb 23, 2023 |
| Linux | curl Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.8 | [curl 7.81.0-1ubuntu1.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-curl-7.81.0-1ubuntu1.8.md) | Feb 14, 2023 |
| Linux | curl amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | curl-debuginfo amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | curl-debugsource amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | curl-minimal amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | curl-minimal-debuginfo amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | libcurl amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | libcurl-debuginfo amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | libcurl-devel amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | libcurl-minimal amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | libcurl-minimal-debuginfo amzn 2023 | 7.88.0-1.amzn2023.0.1 | [ALAS2023-2023-114](https://patchblox.com/security/data/fix/linux/alas2023-2023-114.md) | Feb 21, 2023 |
| Linux | libcurl3-gnutls Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.8 | [libcurl3-gnutls 7.81.0-1ubuntu1.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-gnutls-7.81.0-1ubuntu1.8.md) | Feb 14, 2023 |
| Linux | libcurl3-nss Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.8 | [libcurl3-nss 7.81.0-1ubuntu1.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl3-nss-7.81.0-1ubuntu1.8.md) | Feb 14, 2023 |
| Linux | libcurl4 Ubuntu 22.04.1 LTS (jammy) | 7.81.0-1ubuntu1.8 | [libcurl4 7.81.0-1ubuntu1.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcurl4-7.81.0-1ubuntu1.8.md) | Feb 14, 2023 |

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Data as of 2026-11-08T06:59:42Z 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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