CVE-2026-63451

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.1% (4th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2026-83389 (ENISA EUVD)Source: ENISA EUVD

5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, a locally supplied detection rule that combines frame inspection without content and a transformed match without content can make src/detect-engine-prefilter.c select multiple non-prefilter frame engines while preparing signatures for non-prefilter inspection. Loading the crafted rule, including in test mode, can trigger a heap buffer overflow and crash Suricata; network traffic alone cannot reach the flaw. This issue is fixed in version 8.0.6.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
4th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 18, 2026

Last Modified

September 28, 2026

Advisory Details (6)

Auto-updated Sep 28, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
Web page

Open Information Security Foundation

https://redmine.openinfosecfoundation.org/issues/8590
GitHub advisoryMentions a patch (unverified)

detect: frame rules without content and with transform can cause heap buffer overflow during rule load · Advisory · OISF/suricata · GitHub

https://github.com/OISF/suricata/security/advisories/GHSA-6qwq-j83r-qp34
GitHub release Patch Available

8.0.6

Patch available: OISF/suricata suricata-8.0.6

https://github.com/OISF/suricata/releases/tag/suricata-8.0.6
GitHub pull request

next/1423/20260706/v1

Fix merged in OISF/suricata PR #15807 on 2026-07-06 — awaiting tagged release

https://github.com/OISF/suricata/pull/15807
GitHub commit

commit d62acf5d75a6 (OISF/suricata)

Fix landed in OISF/suricata commit d62acf5d75a6 — awaiting tagged release

https://github.com/OISF/suricata/commit/d62acf5d75a61b76b16815e773408852f41b1975
GitHub commit Patch Available

commit 5449ae170bfc (OISF/suricata)

Patch available: OISF/suricata suricata-8.0.6 (contains commit 5449ae170bfc)

https://github.com/OISF/suricata/commit/5449ae170bfce213907d9bab87143a59774ed48f

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
suricata1:7.0.10-1 ... 1:8.0.7-2~exp1 (29 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
suricata1:7.0.10-1 ... 1:8.0.6-1~bpo13+1 (21 versions)
  • every version up to 1:8.0.6-1: fixed in 1:8.0.6-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 43× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  3. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  4. 2026-10-30 08:55 UTCOSV refresh
  5. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  6. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  7. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  8. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  9. 2026-10-25 14:13 UTCEG score recompute
  10. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-22 19:49 UTCEG score recompute
  13. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-18 03:23 UTCEG score recompute
  19. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-10-12 15:49 UTCEG score recompute
Show 38 more
  1. 2026-10-11 19:33 UTCEG score recompute
  2. 2026-10-11 16:48 UTCEG score recompute
  3. 2026-10-11 14:10 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-11 02:46 UTCEG score recompute
  6. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-09 23:58 UTCEG score recompute
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-08 23:30 UTCEG score recompute
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-06 22:33 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-05 22:04 UTCEG score recompute
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-03 21:09 UTCEG score recompute
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-02 20:41 UTCEG score recompute
  20. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-01 20:13 UTCEG score recompute
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-09-30 19:45 UTCEG score recompute
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-09-29 19:16 UTCEG score recompute
  26. 2026-09-28 18:35 UTCEG score recompute▲ 2.20
  27. 2026-09-28 18:35 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  28. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  29. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  30. 2026-09-26 14:37 UTCEG score recompute
  31. 2026-09-23 18:39 UTCEG score recompute
  32. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  33. 2026-09-21 17:26 UTCEG score recompute
  34. 2026-09-21 16:35 UTCEG score recompute
  35. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  36. 2026-09-18 21:17 UTCEG score recompute
  37. 2026-09-18 20:25 UTCEG score recomputeFirst assessed: 3.3 LOW
  38. 2026-09-18 20:24 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-63451?
CVE-2026-63451 is a medium-severity vulnerability; its CVE record was published on September 18, 2026. Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, a locally supplied detection rule that combines frame inspection without content and a transformed match without content can make…
When was the CVE record for CVE-2026-63451 published?
The CVE record for CVE-2026-63451 was published on September 18, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 28, 2026; the record at its source may have been updated since.
Is CVE-2026-63451 actively exploited?
CVE-2026-63451 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63451?
CVE-2026-63451 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-63451?
A fix for CVE-2026-63451 is available: update to the fixed version the vendor names in its advisory.

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