PT-2026-23867 · Unknown · Cpp-Httplib

Diabl0-Sec · Published 2026-03-07 · Updated 2026-03-26 · CVE-2026-29076

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions cpp-httplib versions prior to 0.37.0

Description The software uses std::regex (libstdc++) to parse RFC 5987 encoded filename* values in multipart Content-Disposition headers. A crafted filename* parameter can cause uncontrolled stack growth due to deep recursion in the regex engine, leading to a stack overflow and server process crash. The issue occurs when processing HTTP POST requests with a specially designed filename* parameter within the Content-Disposition header.

Recommendations Update to version 0.37.0 or later.

Exploit

Fix

DoS

Uncontrolled Recursion

Weakness Enumeration

CWE-674

CWE-1333

Related Identifiers

CVE-2026-29076

GHSA-QQ6V-R583-3H69

OESA-2026-1552

OESA-2026-1553

OESA-2026-1554

OESA-2026-1555

OPENSUSE-SU-2026:10435-1

OPENSUSE-SU-2026:20733-1

SUSE-SU-2026:21599-1

Affected Products

Cpp-Httplib

References · 34

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29076.json · Exploit
• https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6 · Patch
• https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qq6v-r583-3h69 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-28435 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10435-1 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-1553 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-29076 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-1552 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-29076 · Security Note
• https://osv.dev/vulnerability/OESA-2026-1555 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-28434 · Security Note
• https://ubuntu.com/security/CVE-2026-29076 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-29076 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-29076 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-29076 · Vendor Advisory