CVE-2026-71855

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3% (23rd 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
Trending — 3 sources updated this week

Also known asEUVD-2026-83398 (ENISA EUVD)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: 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. Prior to 7.0.17 and 8.0.6, src/flow-hash.c can treat an IPv4 and IPv6 flow as equal without comparing the IP family when their raw address words, ports, protocol, VLAN, recursion level, live device, and hash bucket align. An IPv6 packet can therefore reuse IPv4 flow state or the reverse, causing incorrect flowbit state, detection bypass, or IP-only bypass. This issue is fixed in versions 8.0.6 and 7.0.17.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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
0.3%
EPSS %ILE
23rd
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). 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 (7)

Auto-updated Sep 18, 2026
Patch available. Sources: github, github_commit, github_release.
Web page

Open Information Security Foundation

https://redmine.openinfosecfoundation.org/issues/8558
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 release Patch Available

7.0.17

Patch available: OISF/suricata suricata-7.0.17

https://github.com/OISF/suricata/releases/tag/suricata-7.0.17
GitHub commit

commit bc41dcc854e2 (OISF/suricata)

Fix landed in OISF/suricata commit bc41dcc854e2 — awaiting tagged release

https://github.com/OISF/suricata/commit/bc41dcc854e24487d3786ce578a8a86a8350ab20
GitHub commit Patch Available

commit 4e2f23d031fb (OISF/suricata)

Patch available: OISF/suricata suricata-8.0.6 (contains commit 4e2f23d031fb)

https://github.com/OISF/suricata/commit/4e2f23d031fbcfd72883bacd3d723c9874f23701
GitHub commit Patch Available

commit 181b3b2fdd1f (OISF/suricata)

Patch available: OISF/suricata suricata-7.0.17 (contains commit 181b3b2fdd1f)

https://github.com/OISF/suricata/commit/181b3b2fdd1fe87e4534de4fc79e29a083ef125f
GitHub advisoryMentions a patch (unverified)

flow: IPv4/IPv6 hash collision can reuse wrong flow state · Advisory · OISF/suricata · GitHub

https://github.com/OISF/suricata/security/advisories/GHSA-fvwh-wjcq-2586

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 9× in last 7d / 48× 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. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  4. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-10-28 22:35 UTCEG score recompute
  7. 2026-10-28 20:25 UTCOSV refresh
  8. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-10-25 14:07 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  16. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-10-21 00:01 UTCEG score recompute
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  21. 2026-10-18 03:16 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
Show 50 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-10-13 08:26 UTCEG score recompute
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-10-12 15:42 UTCEG score recompute
  5. 2026-10-11 19:28 UTCEG score recompute
  6. 2026-10-11 16:43 UTCEG score recompute
  7. 2026-10-11 13:57 UTCEG score recompute
  8. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-10-11 00:01 UTCEG score recompute
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-10-09 22:36 UTCEG score recompute
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-08 21:08 UTCEG score recompute
  14. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-10-08 08:25 UTCEG score recompute
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-10-06 18:15 UTCEG score recompute
  18. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  19. 2026-10-06 05:34 UTCEG score recompute
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  21. 2026-10-05 04:05 UTCEG score recompute
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-10-04 02:25 UTCEG score recompute
  24. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-10-03 00:58 UTCEG score recompute
  26. 2026-10-01 22:58 UTCEG score recompute
  27. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  28. 2026-09-30 21:35 UTCEG score recompute
  29. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  30. 2026-09-29 20:05 UTCEG score recompute
  31. 2026-09-29 07:22 UTCEG score recompute
  32. 2026-09-28 18:40 UTCEG score recompute▲ 1.60
  33. 2026-09-28 18:40 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  34. 2026-09-28 18:16 UTCEG score recompute
  35. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  36. 2026-09-27 18:47 UTCEG score recompute
  37. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  38. 2026-09-26 19:48 UTCEG score recompute
  39. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  40. 2026-09-25 20:39 UTCEG score recompute
  41. 2026-09-25 19:29 UTCEG score recompute
  42. 2026-09-24 18:01 UTCEG score recompute
  43. 2026-09-22 17:23 UTCEG score recompute
  44. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  45. 2026-09-21 18:22 UTCEG score recompute
  46. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  47. 2026-09-19 20:25 UTCEG score recompute
  48. 2026-09-18 21:27 UTCEG score recompute
  49. 2026-09-18 20:34 UTCEG score recomputeFirst assessed: 5.9 MEDIUM
  50. 2026-09-18 20:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-71855?
CVE-2026-71855 is a high-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. Prior to 7.0.17 and 8.0.6, src/flow-hash.c can treat an IPv4 and IPv6 flow as equal without comparing the IP family when their raw address words, ports, protocol, VLAN, recursion…
When was the CVE record for CVE-2026-71855 published?
The CVE record for CVE-2026-71855 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-2026-71855 actively exploited?
CVE-2026-71855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71855?
CVE-2026-71855 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-71855?
A fix for CVE-2026-71855 is available: update to the fixed version the vendor names in its advisory.

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