Secuno
ENNL
Book demo

CVE-2026-33745

Yhirose Cpp-httplib information disclosure

7.4 HIGHPublic exploitEPSS 0.35%
  1. Published27 Mar 2026

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.39.0, the cpp-httplib HTTP client forwards stored Basic Auth, Bearer Token, and Digest Auth credentials to arbitrary hosts when following cross-origin HTTP redirects (301/302/307/308). A malicious or compromised server can redirect the client to an attacker-controlled host, which then receives the plaintext credentials in the `Authorization` header. Version 0.39.0 fixes the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Yhirose Cpp-httplib< 0.39.0

Remediation

Fixed in
Yhirose Cpp-httplib≥ 0.39.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-938928.1
IBM TRIRIGA Application Platform 5.0.0 through 5.0.8 could allow a remote authenticated…
CVE-2026-821039.6
IBM DataStage on Cloud Pak for Data 5.4.0.0 could allow a remote authenticated attacker…
CVE-2026-1078118.8
Nginx UI is a web user interface for the Nginx web server. From 2.0.0 until 2.5.0,…
CVE-2026-839438.7
Exposure of sensitive information to an unauthorized actor in Azure API Center allows…
CVE-2026-1065019.6
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1,…
CVE-2026-1064598.5
Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8,…

Frequently asked

Is CVE-2026-33745 being actively exploited?

CVE-2026-33745 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.35%.

How severe is CVE-2026-33745?

CVE-2026-33745 has a CVSS 3.1 base score of 7.4, rated high. EPSS estimates a 0.35% probability of exploitation.

Which products are affected by CVE-2026-33745?

Affected products include Yhirose Cpp-httplib.

How do I fix CVE-2026-33745?

Upgrade affected software to a fixed version, for example Yhirose Cpp-httplib 0.39.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33745 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.