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Vulnerability · Published Jul 6, 2023 · Assigned by GitHub_M

CVE-2023-35934yt-dlp File Downloader cookie leak

Medium 6.1

In plain English

A medium-severity information exposure in yt-dlp from yt-dlp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)1.0%top 35.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

yt-dlp is a command-line program to download videos from video sites. During file downloads, yt-dlp or the external downloaders that yt-dlp employs may leak cookies on HTTP redirects to a different host, or leak them when the host for download fragments differs from their parent manifest's host. This vulnerable behavior is present in yt-dlp prior to 2023.07.06 and nightly 2023.07.06.185519. All native and external downloaders are affected, except for `curl` and `httpie` (version 3.1.0 or later). At the file download stage, all cookies are passed by yt-dlp to the file downloader as a `Cookie` header, thereby losing their scope. This also occurs in yt-dlp's info JSON output, which may be used by external tools. As a result, the downloader or external tool may indiscriminately send cookies with requests to domains or paths for which the cookies are not scoped. yt-dlp version 2023.07.06 and nightly 2023.07.06.185519 fix this issue by removing the `Cookie` header upon HTTP redirects; having native downloaders calculate the `Cookie` header from the cookiejar, utilizing external downloaders' built-in support for cookies instead of passing them as header arguments, disabling HTTP redirectiong if the external downloader does not have proper cookie support, processing cookies passed as HTTP headers to limit their scope, and having a separate field for cookies in the info dict storing more information about scoping Some workarounds are available for those who are unable to upgrade. Avoid using cookies and user authentication methods. While extractors may set custom cookies, these usually do not contain sensitive information. Alternatively, avoid using `--load-info-json`. Or, if authentication is a must: verify the integrity of download links from unknown sources in browser (including redirects) before passing them to yt-dlp; use `curl` as external downloader, since it is not impacted; and/or avoid fragmented formats such as HLS/m3u8, DASH/mpd and ISM.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20yt-dlp2023.07.06-r0ALPINE-CVE-2023-35934
Alpine:v3.21yt-dlp2023.07.06-r0ALPINE-CVE-2023-35934
Alpine:v3.22yt-dlp2023.07.06-r0ALPINE-CVE-2023-35934
Alpine:v3.23yt-dlp2023.07.06-r0ALPINE-CVE-2023-35934
Alpine:v3.24yt-dlp2023.07.06-r0ALPINE-CVE-2023-35934
Debian:12youtube-dlno fix listedDEBIAN-CVE-2023-35934
Debian:12yt-dlpno fix listedDEBIAN-CVE-2023-35934
Debian:13yt-dlp2023.07.06-1DEBIAN-CVE-2023-35934
Debian:14yt-dlp2023.07.06-1DEBIAN-CVE-2023-35934
PyPIyt-dlp2023.7.06PYSEC-2026-2067
PyPIyt-dlp2023.7.06GHSA-v8mc-9377-rwjj
Ubuntu:22.04:LTSyt-dlpno fix listedUBUNTU-CVE-2023-35934
Ubuntu:24.04:LTSyt-dlpno fix listedUBUNTU-CVE-2023-35934
Ubuntu:25.10yt-dlpno fix listedUBUNTU-CVE-2023-35934
Ubuntu:26.04:LTSyt-dlpno fix listedUBUNTU-CVE-2023-35934
Ubuntu:26.10yt-dlpno fix listedUBUNTU-CVE-2023-35934

Affected products (as reported)

VendorProductVersions
yt-dlp yt-dlp yt-dlp < 2023.07.06yt-dlp < nightly 2023.07.06.185519

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N

References