CVE-2025-6497
HTACG tidy-html5 parser.c prvTidyParseNamespace assertion
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
HTACG tidy-html5 parser.c prvTidyParseNamespace assertion
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
CVE-2025-6497- CVSS 4.0
- 4.8 Medium
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 - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R - CVSS 3.0
- 3.3 Low
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R - CVSS 2.0
- 1.7
AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR - Weakness
- CWE-617
- Updated
- 2026-11-02
EUVDEUVD-2025-18860
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
EUVD-2025-18860- CVSS 4.0
- 4.8 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-2843-f6r8-wh6v
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue...
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
GHSA-2843-f6r8-wh6v- CVSS 4.0
- 1.9 Low
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 - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-617
- Updated
- 2026-11-02
NVD
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
CVE-2025-6497- CVSS 4.0
- 1.9 Low
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 - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - CVSS 2.0
- 1.7 Low
AV:L/AC:L/Au:S/C:N/I:N/A:P - Weakness
- CWE-617
- Updated
- 2026-11-02
OSV
HTACG tidy-html5 parser.c prvTidyParseNamespace assertion
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
CVE-2025-6497- CVSS 4.0
- 1.9 Low
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 - Weakness
- CWE-617
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2025-6497
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
DEBIAN-CVE-2025-6497- CVSS 4.0
- 1.9 Low
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 - Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-6497
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
UBUNTU-CVE-2025-6497- CVSS 4.0
- 1.9 Low
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 - CVSS 3.1
- 3.3 Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVAZL-64317 No score
CVE-2025-6497 affecting package tidy 5.8.0-6
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
AZL-64317- Updated
- 2026-11-02
OSVAZL-64323 No score
CVE-2025-6497 affecting package tidy 5.8.0-6
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic. This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.
- Record
AZL-64323- Updated
- 2026-11-05
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
tidyAzure Linux:2 |
through 5.8.0-6 | None known |
tidyAzure Linux:3 |
through 5.8.0-6 | None known |
tidy-html5Debian:12 |
All versions, plus listed versions 2:5.6.0-112:5.7.45-1~exp12:5.8.0-12:5.8.0-1~exp12:5.8.0-1~exp22:5.8.0-22:5.8.0-2.1 |
None known |
tidy-html5Debian:13 |
All versions, plus listed versions 2:5.8.0-22:5.8.0-2.1 |
None known |
tidy-html5Debian:14 |
All versions, plus listed versions 2:5.8.0-22:5.8.0-2.1 |
None known |
tidy-html5Ubuntu:18.04:LTS |
All versions, plus listed versions 1:5.2.0-2 |
None known |
tidy-html5Ubuntu:20.04:LTS |
All versions, plus listed versions 2:5.6.0-102:5.6.0-112:5.6.0-11ubuntu0.20.04.1 |
None known |
tidy-html5Ubuntu:22.04:LTS |
All versions, plus listed versions 2:5.6.0-11build12:5.6.0-11build22:5.6.0-11ubuntu0.22.04.1 |
None known |
tidy-html5Ubuntu:24.04:LTS |
All versions, plus listed versions 2:5.6.0-11build22:5.6.0-11ubuntu12:5.6.0-11ubuntu2 |
None known |
tidy-html5Ubuntu:25.10 |
All versions, plus listed versions 2:5.8.0-1ubuntu12:5.8.0-2 |
None known |
tidy-html5Ubuntu:26.10 |
All versions, plus listed versions 2:5.8.0-2.1 |
None known |
tidy-html5Ubuntu:26.04:LTS |
All versions, plus listed versions 2:5.8.0-22:5.8.0-2.1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-6497 is a medium vulnerability (CVSS 4.8) in Htacg Tidy-html5, published June 23, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. No source names a fixed version.