CVE-2026-26933 json
Improper Validation of Array Index in Packetbeat Leading to Denial of Service
published 7mo ago modified last mo. also GHSA-27qj-9gvp-8rh9 , GO-2026-4789 , EUVD-2026-13142
- cvss
- 5.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 14%
- public exploits
- 0
- none known
Summary
Improper Validation of Array Index (CWE-129) in multiple protocol parser components in Packetbeat can lead Denial of Service via Input Data Manipulation (CAPEC-153). An attacker with the ability to send specially crafted, malformed network packets to a monitored network interface can trigger out-of-bounds read operations, resulting in application crashes or resource exhaustion. This requires the attacker to be positioned on the same network segment as the Packetbeat deployment or to control traffic routed to monitored interfaces.
Patch / fix
- go github.com/elastic/beats/v7 7.0.0-alpha2.0.20260126223743-dec1b31111ec
- elasticsearch packetbeat 8.19.11, 9.2.5
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
Is CVE-2026-26933 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.7 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 5.7 | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/elastic/beats/v7 | <7.0.0-alpha2.0.20260126223743-dec1b31111ec |
7.0.0-alpha2.0.20260126223743-dec1b31111ec |
| go | github.com/elastic/beats | all versions |
no fix listed |
Affected products
- Elastic Packetbeat
Classification
- Weakness
-
- CWE-129 Improper Validation of Array Index
References
-
github.com
/elastic/beats/commit/941098459db6556b837194f40c076b08d51137cb
web, patch
-
github.com
/elastic/beats/commit/dec1b31111ec3500b82db21ba67dde5c914ee94d
web, patch
-
discuss.elastic.co
/t/packetbeat-8-19-11-9-2-5-security-update-esa-2026-11/385533
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-26933
advisory
-
github.com
/elastic/beats
package
-
github.com
/advisories/GHSA-27qj-9gvp-8rh9
advisory
Sources
- CVE List CVE-2026-26933
- GitHub Advisory GHSA-27qj-9gvp-8rh9
- NVD CVE-2026-26933
- OSV GO-2026-4789
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