CVE-2026-32627Public exploitNetwork attack vector

HTTPS interception via disabled redirect certificate verification

Published Mar 13, 2026 · Updated Mar 13, 2026

Improper certificate validation in cpp-httplib before 0.37.2 allows remote attackers to intercept redirected HTTPS connections. ClientImpl::create_redirect_client() unconditionally disables certificate and hostname verification for a new SSLClient when a proxy is set instead of copying the caller's verification settings. Exploitation requires SSL support, a configured proxy, redirect following, and control or interception of the redirect path; credentials and traffic can be read or modified.

CVSS severity8.7
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in cpp-httplib before 0.37.2 allows remote attackers to intercept redirected HTTPS connections. ClientImpl::create_redirect_client() unconditionally disables certificate and hostname verification for a new SSLClient when a proxy is set instead of copying the caller's verification settings. Exploitation requires SSL support, a configured proxy, redirect following, and control or interception of the redirect path; credentials and traffic can be read or modified.

The record

CVE
CVE-2026-32627
Published
Mar 13, 2026
Updated
Mar 13, 2026
Vendor
Yuji Hirose
Product
cpp-httplib
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.37.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Yuji Hirose · cpp-httplibversion=< 0.37.2

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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