CVE-2026-55588

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (43rd 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
6.5EG
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: 0.5%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

ORAS (OCI Registry As Storage) is a CLI and library for managing artifacts in OCI registries. In ORAS CLI versions up to and including 1.3.2, the recursive referrer traversal does not track visited descriptors, so a malicious OCI registry that returns a cyclic referrer graph causes unbounded recursion and memory growth. This affects oras discover, whose recursive traversal is enabled by default because the --depth option defaults to 0 (unlimited), as well as the recursive referrer counting used by the oras backup and oras restore workflows. A cyclic graph can be as simple as A referring to B and B referring back to A. A malicious registry can use this to cause a client-side denial of service, exhausting CPU and memory and hanging automation or CI/CD pipelines that run ORAS against untrusted registry metadata. The vulnerability does not extend to code execution, artifact substitution, or integrity bypass. This issue has been fixed in version 1.3.3.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.5% × 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
0.5%
EPSS %ILE
43rd
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 25, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
Patch available. Sources: github_commit, github.
GitHub commit

commit 440eb65d07a0 (oras-project/oras)

Fix landed in oras-project/oras commit 440eb65d07a0 — awaiting tagged release

https://github.com/oras-project/oras/commit/440eb65d07a0631f131944d28e7c29d562ec17f3
GitHub advisoryMentions a patch (unverified)

Cyclic Referrer Graph Can Cause Unbounded Recursion and Resource Consumption in the ORAS CLI · Advisory · oras-project/oras · GitHub

https://github.com/oras-project/oras/security/advisories/GHSA-298f-872v-2rcx

Vendor Advisories for CVE-2026-55588(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
oras1.2.0-1, 1.2.3-1, 1.3.0-1, 1.3.3-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
oras1.2.0-1, 1.2.3-1, 1.3.0-1
  • every version up to 1.3.3-1: fixed in 1.3.3-1
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
oras.land/oras—
  • every version up to 1.3.3: fixed in 1.3.3
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 53× 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. 2026-10-11 19:38 UTCEG score recompute
  2. 2026-10-11 16:54 UTCEG score recompute
  3. 2026-10-11 14:17 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  6. 2026-10-10 11:11 UTCEG score recompute
  7. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-09 03:42 UTCEG score recompute
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  10. 2026-10-08 02:17 UTCEG score recompute
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-06 17:39 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-05 17:11 UTCEG score recompute
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-03 16:17 UTCEG score recompute
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-02 07:20 UTCEG score recompute
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-01 06:53 UTCEG score recompute
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-30 06:23 UTCEG score recompute
  25. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
Show 59 more
  1. 2026-09-28 23:14 UTCEG score recompute
  2. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-09-27 22:17 UTCEG score recompute
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-09-26 21:38 UTCEG score recompute
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-09-25 04:24 UTCEG score recompute
  8. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-09-24 03:57 UTCEG score recompute
  10. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-09-23 03:25 UTCEG score recompute
  12. 2026-09-22 02:58 UTCEG score recompute
  13. 2026-09-21 02:28 UTCEG score recompute
  14. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-09-20 02:00 UTCEG score recompute
  16. 2026-09-19 01:32 UTCEG score recompute
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  18. 2026-09-18 01:05 UTCEG score recompute
  19. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  20. 2026-09-17 00:37 UTCEG score recompute
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-09-16 00:09 UTCEG score recompute
  24. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  25. 2026-09-13 23:06 UTCEG score recompute
  26. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  27. 2026-09-12 22:38 UTCEG score recompute
  28. 2026-09-11 22:10 UTCEG score recompute
  29. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  30. 2026-09-10 21:41 UTCEG score recompute
  31. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  32. 2026-09-09 00:57 UTCEG score recompute
  33. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  34. 2026-09-07 22:58 UTCEG score recompute
  35. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  36. 2026-09-06 22:31 UTCEG score recompute
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  38. 2026-09-05 22:03 UTCEG score recompute
  39. 2026-09-04 21:34 UTCEG score recompute
  40. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  41. 2026-09-02 20:37 UTCEG score recompute
  42. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  43. 2026-09-01 20:05 UTCEG score recompute
  44. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  45. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  46. 2026-08-31 19:35 UTCEG score recompute
  47. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  48. 2026-08-30 18:59 UTCEG score recompute
  49. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  50. 2026-08-29 18:31 UTCEG score recompute
  51. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  52. 2026-08-27 17:32 UTCEG score recompute
  53. 2026-08-27 17:10 UTCEG score recompute
  54. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  55. 2026-08-26 21:55 UTCEG score recompute
  56. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  57. 2026-08-25 21:26 UTCEG score recompute
  58. 2026-08-25 20:40 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  59. 2026-08-25 20:39 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55588?
CVE-2026-55588 is a medium-severity vulnerability; its CVE record was published on August 25, 2026. ORAS (OCI Registry As Storage) is a CLI and library for managing artifacts in OCI registries. In ORAS CLI versions up to and including 1.3.2, the recursive referrer traversal does not track visited descriptors, so a malicious OCI registry that returns a cyclic referrer graph causes unbounded…
When was the CVE record for CVE-2026-55588 published?
The CVE record for CVE-2026-55588 was published on August 25, 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 9, 2026; the record at its source may have been updated since.
Is CVE-2026-55588 actively exploited?
CVE-2026-55588 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55588?
CVE-2026-55588 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55588?
A fix for CVE-2026-55588 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55588 are linked in the Vendor Advisories panel on this page.

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