High
cpp-httplib — security advisory
cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0 through 0.50.0, the TLS-enabled WebSocket client frees the TLS session before closing the WebSocket that still uses it, producing a use-after-free. In WebSocketClient::shutdown_and_close the SSL object is freed and the pointer cleared, but the subsequent WebSocket close still sends a close frame through the SSL socket stream, which holds a raw copy of the now-dangling session pointer and reads from and writes to the freed memory. The same freed-then-used ordering is reachable through the client's destructor and its connect path, so ordinary teardown of a secure WebSocket connection triggers the defect. This issue is fixed in version 0.50.1.
- Products
- cpp-httplib
- Affected versions
- 0.10.1+ds-1, 0.10.2+ds-1, 0.10.3+ds-1, 0.10.3+ds-1ubuntu0.1~esm1, 0.10.3+ds-1ubuntu0.1~esm2, 0.13.1+ds-1ubuntu1, 0.14.3+ds-1, 0.14.3+ds-1.1, 0.14.3+ds-1.1build1, 0.14.3+ds-1.1build2, 0.14.3+ds-1.1ubuntu0.1~esm1, 0.14.3+ds-1.1ubuntu0.1~esm2, 0.18.7-1, 0.26.0+ds-2ubuntu2, 0.26.0+ds-2ubuntu3, 0.26.0+ds-2ubuntu3+esm1, 0.26.0+ds-2ubuntu4, 0.9.10+ds-1, 0.9.9+ds-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-77358
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:19 UTC · Revision 1
Source evidence
cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0 through 0.50.0, the TLS-enabled WebSocket client frees the TLS session before closing the WebSocket that still uses it, producing a use-after-free. In WebSocketClient::shutdown_and_close the SSL object is freed and the pointer cleared, but the subsequent WebSocket close still sends a close frame through the SSL socket stream, which holds a raw copy of the now-dangling session pointer and reads from and writes to the freed memory. The same freed-then-used ordering is reachable through the client's destructor and its connect path, so ordinary teardown of a secure WebSocket connection triggers the defect. This issue is fixed in version 0.50.1.
osv:UBUNTU-CVE-2026-77358
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
Complete source record
{
"id": "a2f3362f5388eb7736ae9164ac3dfcfaff461990c1fe8ef102242a329ce1763d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-77358",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-77358",
"summary": "cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0 through 0.50.0, the TLS-enabled WebSocket client frees the TLS session before closing the WebSocket that still uses it, producing a use-after-free. In WebSocketClient::shutdown_and_close the SSL object is freed and the pointer cleared, but the subsequent WebSocket close still sends a close frame through the SSL socket stream, which holds a raw copy of the now-dangling session pointer and reads from and writes to the freed memory. The same freed-then-used ordering is reachable through the client's destructor and its connect path, so ordinary teardown of a secure WebSocket connection triggers the defect. This issue is fixed in version 0.50.1.",
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"modified": "2026-10-17T13:01:07.851242647Z",
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"https://www.cve.org/CVERecord?id=CVE-2026-77358",
"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-w7p7-f35j-mw7q",
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"source_id": "core-osv",
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"published_at": "2026-08-28T00:18:00+00:00"
}