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Date: Wed, 26 Oct 2022 08:26:39 +0200 (CEST)
From: Daniel Stenberg <>
To: curl security announcements -- curl users <>,, libcurl hacking <>,
Subject: [SECURITY ADVISORY] CVE-2022-35260: .netrc parser out-of-bounds
 access (curl)

CVE-2022-35260: .netrc parser out-of-bounds access

Project curl Security Advisory, October 26 2022 -


curl can be told to parse a `.netrc` file for credentials. If that file ends
in a line with consecutive non-white space letters and no newline, curl could
read past the end of the stack-based buffer, and if the read works, write a
zero byte possibly beyond its boundary.

This will in most cases cause a segfault or similar, but circumstances might
also cause different outcomes.

If a malicious user can provide a custom netrc file to an application or
otherwise affect its contents, this flaw could be used as denial-of-service.

We are not aware of any exploit of this flaw.


The flaw was introduced in curl with [this
commit](, first shipped
in curl 7.84.0.

The Common Vulnerabilities and Exposures (CVE) project has assigned the name
CVE-2022-35260 to this issue.

CWE-121: Stack-based Buffer Overflow

Severity: low


- Affected versions: curl 7.84.0 to and including 7.85.0
- Not affected versions: curl < 7.84.0 and >= 7.86.0

libcurl is used by many applications, but not always advertised as such!


[The fix for CVE-2022-35260](


  A - Upgrade curl to version 7.86.0

  B - Apply the patch to your local version

  C - Do not use `.netrc` files


This issue was reported to the curl project on October 3, 2022. We contacted
distros@...nwall on October 18, 2022.

libcurl 7.86.0 was released on October 26 2022, coordinated with the
publication of this advisory.


- Reported-by: Hiroki Kurosawa
- Patched-by: Daniel Stenberg

Thanks a lot!


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