CVE-2026-58403

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.5% (39th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
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.

Hugo is a static site generator. From v0.123.0 through v0.163.0, Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree, but a regression caused RootMappingFs.statRoot to call Stat, which follows symlinks, instead of Lstat, so a direct os.ReadFile "somefile" where somefile was a symlink pointing outside the mount would return the target's contents. This effectively let a symlink planted inside a theme or local mount read arbitrary files reachable to the user running hugo. This issue is fixed in v0.163.1.

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% × 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
39th
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

July 6, 2026

Last Modified

July 8, 2026

Advisory Details (4)

Auto-updated Jul 7, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)

Symlink confinement bypass in os.ReadFile · Advisory · gohugoio/hugo · GitHub

https://github.com/gohugoio/hugo/security/advisories/GHSA-c3wq-j5vh-68rc
github_release Patch Available

v0.163.1

Patch available: gohugoio/hugo v0.163.1

https://github.com/gohugoio/hugo/releases/tag/v0.163.1
github_pr

Misc adjustments

Fix merged in gohugoio/hugo PR #15020 on 2026-06-10 — awaiting tagged release

https://github.com/gohugoio/hugo/pull/15020
github_commit

commit cf9c8f93ca2a (gohugoio/hugo)

Fix landed in gohugoio/hugo commit cf9c8f93ca2a — awaiting tagged release

https://github.com/gohugoio/hugo/commit/cf9c8f93ca2a2838ce378f9e36d052ac2f79e229

Vendor Advisories for CVE-2026-58403(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhathugo-main-0.163.3-0.1.hum12026-07-08redhat

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

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
hugo0.131.0-1 ... 0.167.0-2 (50 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
hugo0.131.0-1 ... 0.162.1-7 (43 versions)
  • every version up to 0.165.0-1: fixed in 0.165.0-1
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/gohugoio/hugo—
  • 0.123.0 up to 0.163.1: fixed in 0.163.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 37× 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 178 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 78 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 16:52 UTCEG score recompute
  2. 2026-10-11 14:14 UTCEG score recompute
  3. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  16. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  19. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-09-23 06:23 UTCEG score recompute
  22. 2026-09-23 06:23 UTCVendor advisory
  23. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-09-18 05:59 UTCEG score recompute
Show 75 more
  1. 2026-09-18 05:59 UTCVendor advisory
  2. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-09-14 11:42 UTCEG score recompute
  7. 2026-09-14 11:42 UTCVendor advisory
  8. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-09-13 12:44 UTCEG score recompute
  10. 2026-09-13 12:44 UTCVendor advisory
  11. 2026-09-12 13:37 UTCEG score recompute
  12. 2026-09-12 13:37 UTCVendor advisory
  13. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  14. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-09-05 23:11 UTCEG score recompute
  19. 2026-09-05 23:11 UTCVendor advisory
  20. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-08-30 08:14 UTCEG score recompute
  26. 2026-08-30 08:14 UTCVendor advisory
  27. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  28. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  29. 2026-08-27 21:58 UTCEG score recompute
  30. 2026-08-27 21:58 UTCVendor advisory
  31. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  32. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  33. 2026-08-26 13:55 UTCEG score recompute
  34. 2026-08-26 13:55 UTCVendor advisory
  35. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  36. 2026-08-24 21:44 UTCEG score recompute
  37. 2026-08-24 21:44 UTCVendor advisory
  38. 2026-08-23 22:25 UTCEG score recompute
  39. 2026-08-23 22:25 UTCVendor advisory
  40. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  41. 2026-08-22 23:27 UTCVendor advisory
  42. 2026-08-22 00:24 UTCEG score recompute
  43. 2026-08-22 00:24 UTCVendor advisory
  44. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  45. 2026-08-21 01:24 UTCEG score recompute
  46. 2026-08-21 01:24 UTCVendor advisory
  47. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  48. 2026-08-20 02:27 UTCEG score recompute
  49. 2026-08-20 02:27 UTCVendor advisory
  50. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  51. 2026-08-18 22:29 UTCEG score recompute
  52. 2026-08-18 22:29 UTCVendor advisory
  53. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  54. 2026-08-17 22:40 UTCEG score recompute
  55. 2026-08-17 22:40 UTCVendor advisory
  56. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  57. 2026-08-16 18:27 UTCEG score recompute
  58. 2026-08-16 18:27 UTCVendor advisory
  59. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  60. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  61. 2026-08-15 19:29 UTCEG score recompute
  62. 2026-08-15 19:29 UTCVendor advisory
  63. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  64. 2026-08-14 20:30 UTCEG score recompute
  65. 2026-08-14 20:30 UTCVendor advisory
  66. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  67. 2026-08-13 21:28 UTCVendor advisory
  68. 2026-08-12 22:30 UTCEG score recompute
  69. 2026-08-12 22:30 UTCVendor advisory
  70. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  71. 2026-08-11 23:32 UTCEG score recompute
  72. 2026-08-11 23:32 UTCVendor advisory
  73. 2026-08-11 00:35 UTCEG score recompute
  74. 2026-08-11 00:35 UTCVendor advisory
  75. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile

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Frequently asked(5)

What is CVE-2026-58403?
CVE-2026-58403 is a medium-severity vulnerability; its CVE record was published on July 6, 2026. Hugo is a static site generator. From v0.123.0 through v0.163.0, Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree, but a regression caused RootMappingFs.statRoot to call Stat, which follows symlinks, instead of Lstat, so a direct os.ReadFile…
When was the CVE record for CVE-2026-58403 published?
The CVE record for CVE-2026-58403 was published on July 6, 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 July 8, 2026; the record at its source may have been updated since.
Is CVE-2026-58403 actively exploited?
CVE-2026-58403 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58403?
CVE-2026-58403 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-58403?
A fix for CVE-2026-58403 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-58403 are linked in the Vendor Advisories panel on this page.

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