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CVE-2025-6498

17
FAUCET Score

CVE-2025-6498 is a memory leak vulnerability in HTACG tidy-html5 version 5.8.0, specifically within the defaultAlloc function in src/alloc.c. This flaw has a CVSS score of 5.5 (Medium), indicating it can be exploited locally with low attack complexity, requiring low privileges, and leading to a high impact on availability. While the exploit has been publicly disclosed, there is no evidence of active exploitation, nor are there known Metasploit, Nuclei, or ExploitDB modules. Community discussion and media coverage for this CVE are currently minimal.

Impacted Technologies

VendorProductVersion(s)CPE
5.8.0CPE matchmatch criteria
cpe:2.3:a:htacg:tidy:5.8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

1.9LOW

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
PROOF_OF_CONCEPT
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.20%
Probability of exploitation in next 30 days
EPSS Percentile
9.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0020 is in the 47th percentile among its peer group of 15,937 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media 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

Vendor Advisories (1)

microsoft2025-Jun/CVE-2025-6498Low

HTACG tidy-html5 alloc.c defaultAlloc memory leak

Jun 10, 2025

References

github.com / htacg/tidy-html5/issues/1152
ExploitIssue Tracking
github.com / user-attachments/files/20438303/tidy-html5_crash_3.txt
Exploit
vuldb.com
Permissions RequiredVDB Entry
vuldb.com
Third Party AdvisoryVDB Entry
vuldb.com
Third Party AdvisoryVDB Entry