Vulnerability in cpp-httplib (CVE-2026-46527)
Summary
Vulnerability in cpp-httplib (CVE-2026-46527). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.44.0 or later.
Original description
The description as published by the source.
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the server has called Server::set_trusted_proxies() with a non-empty trusted-proxy list, an attacker can send an HTTP request that includes an X-Forwarded-For header whose value parses to no valid IP segments. The code path then executes get_client_ip(), which calls front() on an empty std::vector—undefined behavior in C++. On typical implementations this manifests as abnormal process termination (denial of service). With Sanitizers enabled, you get an explicit runtime diagnostic. This vulnerability is fixed in 0.44.0.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-46527 has been found in cpp-httplib.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade cpp-httplib to 0.44.0 or later.
If unsure, ask your IT team or search "cpp-httplib CVE-2026-46527" on the vendor's site.
CVE-2026-46527 (cpp-httplib) — CWE-476 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 0.44.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-476) exists in cpp-httplib.
Check the vendor advisory for the affected versions of cpp-httplib.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 0.44.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'cpp-httplib' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'cpp-httplib' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
cpp-httplibを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade cpp-httplib to 0.44.0ステージング環境で 0.44.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-46527 cpp-httplib
- Ubuntu UBUNTU-CVE-2026-46527 cpp-httplib
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov