CVE-2026-55785

LOWPre-NVD 3.73.7
EchelonGraph scoreMEDIUM confidence

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

This low-severity CVE scores 3.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (36th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
3.7EG
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: 0.4%CVSS: 3.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the AUSF component performs cryptographic authentication comparisons in internal/sbi/processor/ue_authentication.go with ordinary equality helpers. Auth5gAkaComfirmRequestProcedure compares RES* and XRES* with strings.EqualFold and logs the expected XRES* value at INFO level before comparison. EapAuthComfirmRequestProcedure compares AT_MAC and XMAC with bytes.Equal and evaluates XRES == RES with ordinary string equality. These comparisons can return at mismatch-dependent times, although testing did not demonstrate a practical remote timing oracle because of HTTP/SBI timing noise. The INFO log exposes authentication material to operators, log collectors, sidecars, or processes able to read AUSF logs. This issue is fixed in version 1.4.5.

CVSS v3
3.7
EG Score
3.7LOWmedium confidence
EG Risk
17
EG Risk 17/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity37% × 45%
The EG Score, 3.7 of 10.
Exploitation0.4% × 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
0.4%
EPSS %ILE
36th
KEV
Not listed

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.

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

August 28, 2026

Last Modified

September 8, 2026

References (4)

Vendor Advisories for CVE-2026-55785(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/free5gc/ausf—
  • every version up to 1.4.5: fixed in 1.4.5
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 39× 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. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-09 05:17 UTCEG score recompute
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  14. 2026-10-06 11:09 UTCEG score recompute
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-03 16:09 UTCEG score recompute
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-09-30 22:03 UTCEG score recompute
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-09-28 03:56 UTCEG score recompute
Show 37 more
  1. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-09-25 09:50 UTCEG score recompute
  4. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  6. 2026-09-22 15:44 UTCEG score recompute
  7. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-09-19 21:38 UTCEG score recompute
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  11. 2026-09-17 03:32 UTCEG score recompute
  12. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  13. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  14. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  15. 2026-09-14 09:26 UTCEG score recompute
  16. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-09-11 15:20 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  19. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  20. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  21. 2026-09-08 21:13 UTCEG score recompute
  22. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-09-06 07:42 UTCEG score recompute
  25. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  26. 2026-09-03 13:36 UTCEG score recompute
  27. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  28. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  30. 2026-08-31 19:30 UTCEG score recompute
  31. 2026-08-31 18:56 UTCEG score recompute
  32. 2026-08-31 17:34 UTCEG score recompute
  33. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  35. 2026-08-28 23:25 UTCEG score recompute
  36. 2026-08-28 22:35 UTCEG score recomputeFirst assessed: 3.7 LOW
  37. 2026-08-28 22:33 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55785?
CVE-2026-55785 is a low-severity vulnerability; its CVE record was published on August 28, 2026. free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the AUSF component performs cryptographic authentication comparisons in internal/sbi/processor/ueauthentication.go with ordinary equality helpers. Auth5gAkaComfirmRequestProcedure compares RES* and XRES* with…
When was the CVE record for CVE-2026-55785 published?
The CVE record for CVE-2026-55785 was published on August 28, 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 8, 2026; the record at its source may have been updated since.
Is CVE-2026-55785 actively exploited?
CVE-2026-55785 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55785?
CVE-2026-55785 has a CVSS base score of 3.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55785?
A fix for CVE-2026-55785 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55785 are linked in the Vendor Advisories panel on this page.

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