High
TLS session resumption client cert bypass (again)
Type: advisorySources: OSV
libcurl would attempt to resume a TLS session even if the client certificate had changed. That is unacceptable since a server by specification is allowed to skip the client certificate check on resume, and may instead use the old identity which was established by the previous certificate (or no certificate). libcurl supports by default the use of TLS session id/ticket to resume previous TLS sessions to speed up subsequent TLS handshakes. They are used when for any reason an existing TLS connection could not be kept alive to make the next handshake faster. This flaw is a regression and identical to [CVE-2016-5419](https://curl.se/docs/CVE-2016-5419.html) reported on August 3rd 2016, but affecting a different version range.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2017-7468
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:37 UTC · Revision 1
Source evidence
TLS session resumption client cert bypass (again)
core-osv · Original sourcePublished 19 Apr 2017, 08:00 UTC
libcurl would attempt to resume a TLS session even if the client certificate had changed. That is unacceptable since a server by specification is allowed to skip the client certificate check on resume, and may instead use the old identity which was established by the previous certificate (or no certificate). libcurl supports by default the use of TLS session id/ticket to resume previous TLS sessions to speed up subsequent TLS handshakes. They are used when for any reason an existing TLS connection could not be kept alive to make the next handshake faster. This flaw is a regression and identical to [CVE-2016-5419](https://curl.se/docs/CVE-2016-5419.html) reported on August 3rd 2016, but affecting a different version range.
osv:CURL-CVE-2017-7468
Complete source record
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