CVE-2026-29076

MEDIUM EPSS 44.3%
Published Mar 7, 20263mo ago · Modified Mar 9, 20263mo ago
5.9 CVSS 3.1
Medium
Find Similar
Published Mar 7, 2026 3mo ago
Last Modified Mar 9, 2026 3mo ago

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.37.0, cpp-httplib uses std::regex (libstdc++) to parse RFC 5987 encoded filename* values in multipart Content-Disposition headers. The regex engine in libstdc++ implements backtracking via deep recursion, consuming one stack frame per input character. An attacker can send a single HTTP POST request with a crafted filename* parameter that causes uncontrolled stack growth, resulting in a stack overflow (SIGSEGV) that crashes the server process. This issue has been patched in version 0.37.0.

CVSS Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
44.3% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-1333
CWE-674

Affected Products 1

VendorProductVersionRange
yhirosecpp-httplib* <0.37.0

References 3

  • github.com https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6
    Patch
  • github.com https://github.com/yhirose/cpp-httplib/releases/tag/v0.37.0
    ProductRelease Notes
  • github.com https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qq6v-r583-3h69
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6
    Patch