CVE-2026-52791

LOWPre-NVD 2.02.0
EchelonGraph scoreMEDIUM confidence

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

This low-severity CVE scores 2.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (3rd 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
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-50403 (ENISA EUVD)Source: ENISA EUVD

2.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 2.0Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.

CVSS v3
2.0
EG Score
2.0LOWmedium 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)
Severity20% × 45%
Impact severity (EG Severity): CVSS 2.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
3rd
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 (2.0): severity, escalated by confirmed exploitation. This CVE's 2.0 is its impact severity (EG Severity), not escalated.

EG Severity
2.0 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · 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 low or medium mission impact; Track* at high (mission-essential systems).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: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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

July 29, 2026

Last Modified

October 24, 2026

References (3)

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatfuse-overlayfs-main-1.17-1.hum12026-08-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
fuse-overlayfs1.10-1 ... 1.9-1 (7 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
fuse-overlayfs1.10-1, 1.13-1, 1.14-1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
fuse-overlayfs1.14-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
fuse-overlayfs1.14-1
  • every version on: no fix on record
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 44× 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.

Showing the most recent 100 of 109 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 9 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-25 14:21 UTCEG score recompute
  5. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-10-24 13:35 UTCEG score recompute
  7. 2026-10-24 13:35 UTCVendor advisory
  8. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-18 03:32 UTCEG score recompute
  15. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-12 15:58 UTCEG score recompute
  22. 2026-10-11 19:41 UTCEG score recompute
  23. 2026-10-11 16:56 UTCEG score recompute
  24. 2026-10-11 14:19 UTCEG score recompute
  25. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
Show 75 more
  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-04 07:01 UTCEG score recompute
  9. 2026-10-04 07:01 UTCVendor advisory
  10. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-01 03:34 UTCEG score recompute
  14. 2026-10-01 03:34 UTCVendor advisory
  15. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-09-27 19:38 UTCEG score recompute
  19. 2026-09-27 19:38 UTCVendor advisory
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-09-23 01:57 UTCEG score recompute
  25. 2026-09-23 01:57 UTCVendor advisory
  26. 2026-09-20 01:45 UTCEG score recompute
  27. 2026-09-20 01:45 UTCVendor advisory
  28. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  29. 2026-09-17 01:35 UTCEG score recompute
  30. 2026-09-17 01:35 UTCVendor advisory
  31. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  32. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  33. 2026-09-13 20:30 UTCEG score recompute
  34. 2026-09-13 20:30 UTCVendor advisory
  35. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  36. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  37. 2026-09-10 20:19 UTCEG score recompute
  38. 2026-09-10 20:19 UTCVendor advisory
  39. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  40. 2026-09-09 07:47 UTCEG score recompute
  41. 2026-09-09 07:47 UTCVendor advisory
  42. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  43. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  44. 2026-09-05 05:11 UTCEG score recompute
  45. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  46. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  47. 2026-09-01 23:29 UTCEG score recompute
  48. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  49. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  50. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  51. 2026-08-29 23:17 UTCEG score recompute
  52. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  53. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  54. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  55. 2026-08-25 20:08 UTCEG score recompute
  56. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-08-22 19:57 UTCEG score recompute
  58. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  59. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  60. 2026-08-19 19:46 UTCEG score recompute
  61. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  62. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  63. 2026-08-16 19:36 UTCEG score recompute
  64. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  65. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  66. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  67. 2026-08-13 19:25 UTCEG score recompute
  68. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  69. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  70. 2026-08-10 19:12 UTCEG score recompute
  71. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  72. 2026-08-07 19:01 UTCEG score recompute
  73. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  74. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  75. 2026-08-04 18:51 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-52791?
CVE-2026-52791 is a low-severity vulnerability; its CVE record was published on July 29, 2026. fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with…
When was the CVE record for CVE-2026-52791 published?
The CVE record for CVE-2026-52791 was published on July 29, 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 October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-52791 actively exploited?
CVE-2026-52791 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52791?
CVE-2026-52791 has a CVSS base score of 2.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-52791?
A fix for CVE-2026-52791 is available: update to the fixed version the vendor names in its advisory.

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