cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend versions from 0.31.0 through 0.46.1 and wolfSSL backend versions from 0.33.0 through 0.46.1, when cpp-httplib is built with CPPHTTPLIB_MBEDTLS_SUPPORT or CPPHTTPLIB_WOLFSSL_SUPPORT and a client connects to an IP-literal host with server certificate verification enabled, SSLClient and Client in HTTPS mode skip certificate chain validation and WebSocketClient on the Mbed TLS backend skips verification altogether, allowing a man-in-the-middle attacker positioned to intercept traffic to present a crafted certificate and read or modify the traffic. This issue is fixed in version 0.47.0.
CVE-2026-54919
HIGHPre-NVD 7.47.4—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 82% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.4Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.4
- EG Score
- 7.4(medium)
- EPSS
- 17.9%
- KEV
- Not listed
Published
July 10, 2026
Last Modified
July 10, 2026
Advisory Details (3)
Auto-updated Jul 10, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
TLS certificate chain verification bypassed for IP-literal hosts on Mbed TLS and wolfSSL backends · Advisory · yhirose/cpp-httplib · GitHub
Affected: v0.47.0. Chain verification now remains enabled for IP-literal hosts, and the cer
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-8ffh-4p95-g3p2github_release Patch Available
v0.47.0
Patch available: yhirose/cpp-httplib v0.47.0
https://github.com/yhirose/cpp-httplib/releases/tag/v0.47.0github_commit Patch Available
commit fa981cedae00 (yhirose/cpp-httplib)
Patch available: yhirose/cpp-httplib v0.47.0 (contains commit fa981cedae00)
https://github.com/yhirose/cpp-httplib/commit/fa981cedae004ea9d946f1392b9dec22fac6fee6Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-12 21:21 UTCEG score recompute
- 2026-07-12 08:09 UTCEG score recompute
- 2026-07-12 05:46 UTCEPSS rescore
- 2026-07-11 18:57 UTCEG score recompute
- 2026-07-11 05:45 UTCEG score recompute
- 2026-07-10 16:33 UTCEG score recompute
- 2026-07-10 16:32 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-295
Frequently asked(5)
What is CVE-2026-54919?
CVE-2026-54919 is a high vulnerability published on July 10, 2026. cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend versions from 0.31.0 through 0.46.1 and wolfSSL backend versions from 0.33.0 through 0.46.1, when cpp-httplib is built with CPPHTTPLIBMBEDTLSSUPPORT or CPPHTTPLIBWOLFSSLSUPPORT and a…
When was CVE-2026-54919 disclosed?
CVE-2026-54919 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54919 actively exploited?
CVE-2026-54919 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54919?
CVE-2026-54919 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-54919?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54919, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-54919
Is Your Infrastructure Affected by CVE-2026-54919?
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