CVE-2026-10618

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-08-24. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

A fix is available — apply it.

Hugo's default fenced-code-block renderer writes attribute values taken from the code-fence info string into the rendered HTML without escaping them. New in markup/internal/attributes/attributes.go converts every attribute value from a byte slice to a string as it is stored, deliberately dropping the escaping that used to happen there, and RenderAttributes in the same file escapes only values that are still byte slices, so its escaping branch is never reached and every value is written verbatim. The function's documentation states that it performs HTML escaping of string attributes, which it does not. A quote inside an attribute value in the info string therefore terminates the attribute and allows a further attribute, including an event handler, to be placed on the wrapper element, and the script runs for every visitor who loads the page. This path is reached under the default configuration, with code fences enabled and without goldmark's unsafe setting or any custom render hook. Attribute names beginning with on are filtered when the attributes are parsed, so injection is achieved through the value rather than the name.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 26, 2026

Advisory Details (5)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic

Hugo 0.93.0 through 0.165.0 Stored Cross-Site Scripting via Unescaped Code-Fence Attribute Values | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hugo-through-stored-cross-site-scripting-via-unescaped-code-fence-attribute-values
generic

hugo/markup/highlight/highlight.go at v0.165.0 · gohugoio/hugo · GitHub

https://github.com/gohugoio/hugo/blob/v0.165.0/markup/highlight/highlight.go
generic

hugo/markup/goldmark/codeblocks/render.go at v0.165.0 · gohugoio/hugo · GitHub

https://github.com/gohugoio/hugo/blob/v0.165.0/markup/goldmark/codeblocks/render.go
generic

hugo/markup/internal/attributes/attributes.go at v0.165.0 · gohugoio/hugo · GitHub

https://github.com/gohugoio/hugo/blob/v0.165.0/markup/internal/attributes/attributes.go
generic

GitHub - gohugoio/hugo: The world’s fastest framework for building websites. · GitHub

https://github.com/gohugoio/hugo

Vendor Advisories for CVE-2026-10618(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 / EcosystemFixed in / PatchReleasedSource
redhathugo-main-0.166.0-0.1.hum12026-09-09redhat

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:12(1)
PackageVulnerable rangeFixed inDependents
hugo0.111.3-1 ... 0.165.0-2 (82 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
hugo0.131.0-1 ... 0.165.0-2 (45 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
hugo0.131.0-1 ... 0.165.0-2 (45 versions)——

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 23× in last 7d / 87× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-09-20 23:27 UTCEG score recompute
  2. 2026-09-20 23:27 UTCVendor advisory
  3. 2026-09-20 23:27 UTCGHSA enrichment
  4. 2026-09-20 20:15 UTCEPSS rescore
  5. 2026-09-19 23:30 UTCEG score recompute
  6. 2026-09-19 23:30 UTCVendor advisory
  7. 2026-09-19 23:30 UTCGHSA enrichment
  8. 2026-09-18 23:48 UTCEG score recompute
  9. 2026-09-18 23:48 UTCVendor advisory
  10. 2026-09-18 23:48 UTCGHSA enrichment
  11. 2026-09-18 19:27 UTCEPSS rescore
  12. 2026-09-18 00:06 UTCEG score recompute
  13. 2026-09-18 00:06 UTCVendor advisory
  14. 2026-09-18 00:06 UTCGHSA enrichment
  15. 2026-09-16 23:20 UTCEG score recompute
  16. 2026-09-16 23:20 UTCVendor advisory
  17. 2026-09-16 23:20 UTCGHSA enrichment
  18. 2026-09-16 05:14 UTCEPSS rescore
  19. 2026-09-15 23:37 UTCEG score recompute
  20. 2026-09-15 23:37 UTCVendor advisory
  21. 2026-09-15 23:37 UTCGHSA enrichment
  22. 2026-09-14 23:53 UTCVendor advisory
  23. 2026-09-14 23:52 UTCGHSA enrichment
  24. 2026-09-14 00:10 UTCEG score recompute
  25. 2026-09-14 00:10 UTCVendor advisory
Show 62 more
  1. 2026-09-14 00:10 UTCGHSA enrichment
  2. 2026-09-13 16:46 UTCEPSS rescore
  3. 2026-09-13 00:25 UTCEG score recompute
  4. 2026-09-13 00:25 UTCVendor advisory
  5. 2026-09-13 00:25 UTCGHSA enrichment
  6. 2026-09-12 15:00 UTCEPSS rescore
  7. 2026-09-12 00:42 UTCEG score recompute
  8. 2026-09-12 00:42 UTCVendor advisory
  9. 2026-09-12 00:42 UTCGHSA enrichment
  10. 2026-09-11 14:52 UTCEPSS rescore
  11. 2026-09-11 09:36 UTCEPSS rescore
  12. 2026-09-11 00:59 UTCEG score recompute
  13. 2026-09-11 00:59 UTCVendor advisory
  14. 2026-09-11 00:59 UTCGHSA enrichment
  15. 2026-09-10 09:34 UTCEPSS rescore
  16. 2026-09-10 01:16 UTCGHSA enrichment
  17. 2026-09-09 01:34 UTCEG score recompute
  18. 2026-09-09 01:34 UTCGHSA enrichment
  19. 2026-09-08 22:00 UTCEPSS rescore
  20. 2026-09-07 20:12 UTCEG score recompute
  21. 2026-09-07 20:12 UTCGHSA enrichment
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 20:30 UTCEG score recompute
  24. 2026-09-06 20:30 UTCGHSA enrichment
  25. 2026-09-06 13:47 UTCEPSS rescore
  26. 2026-09-05 20:47 UTCEG score recompute
  27. 2026-09-05 20:46 UTCGHSA enrichment
  28. 2026-09-04 21:04 UTCEG score recompute
  29. 2026-09-04 21:04 UTCGHSA enrichment
  30. 2026-09-04 05:06 UTCEPSS rescore
  31. 2026-09-03 20:32 UTCGHSA enrichment
  32. 2026-09-02 20:49 UTCEG score recompute
  33. 2026-09-02 20:49 UTCGHSA enrichment
  34. 2026-09-02 14:11 UTCEPSS rescore
  35. 2026-09-01 17:52 UTCEG score recompute
  36. 2026-09-01 17:51 UTCGHSA enrichment
  37. 2026-09-01 13:53 UTCEPSS rescore
  38. 2026-09-01 04:39 UTCEPSS rescore
  39. 2026-08-31 18:09 UTCEG score recompute
  40. 2026-08-31 18:09 UTCGHSA enrichment
  41. 2026-08-30 19:17 UTCEPSS rescore
  42. 2026-08-30 18:24 UTCEG score recompute
  43. 2026-08-30 18:24 UTCGHSA enrichment
  44. 2026-08-30 01:21 UTCEPSS rescore
  45. 2026-08-29 18:42 UTCEG score recompute
  46. 2026-08-29 18:41 UTCGHSA enrichment
  47. 2026-08-28 21:40 UTCEPSS rescore
  48. 2026-08-28 18:51 UTCGHSA enrichment
  49. 2026-08-27 19:06 UTCEG score recompute
  50. 2026-08-27 19:06 UTCGHSA enrichment
  51. 2026-08-27 14:24 UTCEPSS rescore
  52. 2026-08-26 19:23 UTCEG score recompute
  53. 2026-08-26 19:22 UTCGHSA enrichment
  54. 2026-08-26 18:41 UTCEG score recompute
  55. 2026-08-26 18:41 UTCGHSA enrichment
  56. 2026-08-26 10:46 UTCEG score recompute
  57. 2026-08-26 10:46 UTCGHSA enrichment
  58. 2026-08-25 13:48 UTCEPSS rescore
  59. 2026-08-25 11:03 UTCEG score recompute
  60. 2026-08-25 11:03 UTCGHSA enrichment
  61. 2026-08-24 10:42 UTCEG score recompute
  62. 2026-08-24 10:41 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Same vendor

1 shown

redhat:RHSA-2026:66266

Frequently asked(5)

What is CVE-2026-10618?
CVE-2026-10618 is a medium vulnerability published on August 24, 2026. Hugo's default fenced-code-block renderer writes attribute values taken from the code-fence info string into the rendered HTML without escaping them. New in markup/internal/attributes/attributes.go converts every attribute value from a byte slice to a string as it is stored, deliberately dropping…
When was CVE-2026-10618 disclosed?
CVE-2026-10618 was first published in the National Vulnerability Database on August 24, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-10618 actively exploited?
CVE-2026-10618 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.8% of all scored CVEs.
What is the CVSS score of CVE-2026-10618?
CVE-2026-10618 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-10618?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10618, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-10618

Explore →

Is Your Infrastructure Affected by CVE-2026-10618?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs