CVE-2026-73258 Details
Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can place a lone carriage return or line feed in multipart input processed by mg_http_next_multipart() in src/http.c. The loops comparing s[b] and s[b + 1], and s[h2] and s[h2 + 1], use an incorrect AND condition and stop when either character resembles part of a CRLF terminator. This truncates headers, filenames, or boundaries and can cause an application to accept dangerous content after seeing a misleading Content-Type value. This issue is fixed in version 7.22.
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Exploit prediction scoring system (EPSS) score for CVE-2026-73258
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.46 Probability of exploitation activity being observed over the next 30 days (38th percentile)
CVSS score for CVE-2026-73258
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
6.5 Medium
Products affected by CVE-2026-73258
Mongoose 6.10
Mongoose 6.11
Mongoose 6.12
Mongoose 6.13
Mongoose 6.14
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-73258 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
CN 99 21.62%
US 56 12.23%
BR 55 12.01%
DE 48 10.48%
KR 44 9.61%
VN 18 3.93%
TR 13 2.84%
MY 12 2.62%
PL 10 2.18%
IT 9 1.97%

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CVE-2026-73258 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Telecommunications 219 66.97%
Technology 102 31.19%
Government/Politics 2 0.61%
Retail 1 0.31%
Utilities 1 0.31%
Energy/Resources 1 0.31%
Media/Entertainment 1 0.31%

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