CVE-2026-31870 is a high-severity denial-of-service vulnerability affecting yhirose cpp_httplib versions prior to 0.37.1. A malicious server can crash a client application by sending a malformed Content-Length header during streaming API calls, which triggers an unhandled exception. This network-based attack has low complexity, requiring no authentication or user interaction, and results in a CVSS score of 7.5 (Availability: High). There is currently no evidence of active exploitation, nor are public exploit tools or significant community discussion available for this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.37.1CPE matchmatch criteria | cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.