Double free in XSLT in 'show_index'
Published Jan 26, 2026
6.5
MEDIUMCVSS 3.1
EPSS 0.38%
Description
A Double Free in XSLT `show_index` has been identified in Hiawatha webserver version 11.7 which allows an unauthenticated attacker to corrupt data which may lead to arbitrary code execution.
Affected products
-
- Version 11.47StatusaffectedConstraints<=10.8.2
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Hiawatha | Hiawatha Web server | n/a |
|
- 11.7
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Jan 26, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Jan–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.38% (0.00379) | 29.52th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.34% (0.00344) | 26.00th | v5 (v2026.06.15) |
| Jan 27, 2026 | 0.09% (0.00088) | 25.44th | v4 (v2025.03.14) |
References (1)
| Link | Providers | Tags |
|---|---|---|
| https://gitlab.com/hsleisink/hiawatha/-/blame/master/src/xslt.c?ref_type=heads#L675 | Release Notes |
Change history (0)
No recorded changes yet.