xapian-core: Xapian xapian-core: Arbitrary code execution via incomplete HTML escaping
Published Aug 20, 2026
4.4
MEDIUMCVSS 3.1
EPSS 0.25%
Description
A cross-site scripting vulnerability in queryparser/termgenerator_internal.cc in Xapian xapian-core before 2.1.0 and before 1.4.32 exists due to incomplete HTML escaping by Xapian::MSet::snippet(). NOTE: this issue exists because of a missed corner case of CVE-2018-0499.
Affected products
-
- Version 0StatusaffectedConstraints<1.4.32
- Version 2.0.0StatusaffectedConstraints<2.1.0
- 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Xapian | Xapian-Core | unaffected |
|
No data.
No data.
Red Hat Enterprise Linux 10
xapian-core
Fix deferred
Red Hat Enterprise Linux 8
xapian-core
Fix deferred
Red Hat Enterprise Linux 9
xapian-core
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | xapian-core | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | xapian-core | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | xapian-core | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/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
NoTechnical Impact
PartialDecision
n/aAssessed Aug 28, 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
Aug–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.25% (0.00252) | 15.20th | v5 (v2026.06.15) |
| Aug 21, 2026 | 0.16% (0.00156) | 5.27th | v5 (v2026.06.15) |
References (7)
- https://access.redhat.com/security/cve/CVE-2026-77643 Vendor Advisory
- https://bugs.debian.org/1144490
- https://bugzilla.redhat.com/show_bug.cgi?id=2520814 Issue Tracking
- https://lists.xapian.org/pipermail/xapian-devel/2026-August/003429.html
- https://nvd.nist.gov/vuln/detail/CVE-2026-77643
- https://trac.xapian.org/wiki/SecurityFixes/2018-07-02#a2026-08-13update
- https://www.cve.org/CVERecord?id=CVE-2026-77643
Change history (0)
No recorded changes yet.