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CVE-2026-32627VulnerabilityPublished Updated

Prior to 0.37.2, when a cpp-httplib client is configured with a proxy and set_follow_location(true), any HTTPS

Affects cpp-httplibSource GCVE Database

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Authoritative record:CVE-2026-32627· High 8.7

Not known to be exploited · CVSS 8.7 High · fixed in 0.37.2 : patch cpp-httplib soon.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.37.2
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10cpp-httplibpkg:deb/ubuntu/cpp-httplib?arch=source&distro=stonkingOther threatsAffected
  • =0.26.0+ds-2ubuntu3
  • =0.26.0+ds-2ubuntu4
Fixed in–
Ubuntu Pro 26.04 LTScpp-httplibpkg:deb/ubuntu/cpp-httplib?arch=source&distro=esm-apps/resoluteOther threatsAffected
  • 0.18.7-1 – 0.26.0+ds-2ubuntu3+esm1
4 affected builds
Fixed in–
Ubuntu 25.10cpp-httplibpkg:deb/ubuntu/cpp-httplib?arch=source&distro=questingOther threatsAffected
  • =0.18.7-1
  • =0.18.7-1ubuntu0.25.10.1
  • =0.18.7-1ubuntu0.25.10.2
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade cpp-httplib to version 0.37.2 or later, where this vulnerability is fixed. Until then, avoid configuring clients with both proxy usage and set_follow_location(true) enabled, or implement additional TLS verification checks outside the library. No other vendor advisory mitigation is provided.

Description

cpp-httplib versions prior to 0.37.2 have a vulnerability where HTTPS redirects followed by a client configured with a proxy and set_follow_location(true) disable TLS certificate and hostname verification. This allows acceptance of any certificate from the redirect target, including expired or forged ones, without error. A network attacker able to return a redirect response can intercept the redirected HTTPS connection and capture sensitive data such as credentials or session tokens. The issue is fixed in version 0.37.2.

References

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