Medium
Bad connection reuse due to flawed path name checks
Type: advisorySources: OSV
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse, if one of them matches the setup. Due to errors in the logic, the config matching function did not take 'issuer cert' into account and it compared the involved paths *case insensitively*, which could lead to libcurl reusing wrong connections. File paths are, or can be, case sensitive on many systems but not all, and can even vary depending on used file systems. The comparison also did not include the 'issuer cert' which a transfer can set to qualify how to verify the server certificate.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-22924
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:37 UTC · Revision 1
Source evidence
Bad connection reuse due to flawed path name checks
core-osv · Original sourcePublished 21 Jul 2021, 08:00 UTC
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse, if one of them matches the setup. Due to errors in the logic, the config matching function did not take 'issuer cert' into account and it compared the involved paths *case insensitively*, which could lead to libcurl reusing wrong connections. File paths are, or can be, case sensitive on many systems but not all, and can even vary depending on used file systems. The comparison also did not include the 'issuer cert' which a transfer can set to qualify how to verify the server certificate.
osv:CURL-CVE-2021-22924
Complete source record
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"title": "Bad connection reuse due to flawed path name checks",
"summary": "libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse, if one of them matches the setup. Due to errors in the logic, the config matching function did not take 'issuer cert' into account and it compared the involved paths *case insensitively*, which could lead to libcurl reusing wrong connections. File paths are, or can be, case sensitive on many systems but not all, and can even vary depending on used file systems. The comparison also did not include the 'issuer cert' which a transfer can set to qualify how to verify the server certificate.",
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