CVE catalog
CVE-2026-77358
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, producin
- Severity
- High · CVSS 8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.45% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | cpp-httplib | sid | 0.41.0+ds-3 | vulnerable |
| Debian | cpp-httplib | forky | 0.41.0+ds-3 | vulnerable |
| Debian | cpp-httplib | trixie | 0.18.7-1+deb13u1 | vulnerable |
| Debian | cpp-httplib | trixie-security | 0.18.7-1+deb13u1 | vulnerable |
| Debian | cpp-httplib | bookworm | 0.11.4+ds-1+deb12u1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | cpp-httplib | source | sid | (unfixed) | not yet assigned | Not reported | [1145977] |
| Debian | cpp-httplib | source | forky | (unfixed) | not yet assigned | Not reported | [1145977] |
| Debian | cpp-httplib | source | trixie | (unfixed) | not yet assigned | Not reported | [1145977] |
| Debian | cpp-httplib | source | bookworm | (unfixed) | not yet assigned | Not reported | [1145977] |
Notes
[trixie] cpp-httplib: Minor issue [bookworm] cpp-httplib: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libcpp-httplib0.11]Affected
Source package: [cpp-httplib]
Details (2)
0.11.4+ds-1+deb12u1· amd64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
0.11.4+ds-1+deb12u1· arm64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
- [libcpp-httplib-dev]Affected
Source package: [cpp-httplib]
Details (2)
0.11.4+ds-1+deb12u1· amd64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
0.11.4+ds-1+deb12u1· arm64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
[Debian 13 (Trixie)]
- [libcpp-httplib0.18]Affected
Source package: [cpp-httplib]
Details (4)
0.18.7-1+deb13u1· amd64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· amd64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
- [libcpp-httplib0.41]Affected
Source package: [cpp-httplib]
Details (2)
0.41.0+ds-3~bpo13+1· amd64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
0.41.0+ds-3~bpo13+1· arm64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
- [libcpp-httplib-dev]Affected
Source package: [cpp-httplib]
Details (6)
0.18.7-1+deb13u1· amd64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.41.0+ds-3~bpo13+1· amd64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
0.41.0+ds-3~bpo13+1· arm64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· amd64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11979-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-77358]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-77358]
- [https://security-tracker.debian.org/tracker/CVE-2026-77358]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77358.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]