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.netrc parser out-of-bounds access

Project curl Security Advisory, October 26 2022 - Permalink


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 does 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.


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


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



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@openwall on October 18, 2022.

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


Thanks a lot!