CVE-2026-77354

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd 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, secondary
Elevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.7Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

kin-openapi is a Go project for handling OpenAPI files. From 0.124.0 until 0.142.0, openapi3filter.sliceMapToSlice in openapi3filter/req_resp_decoder.go converts attacker-controlled sparse indexes from a deepObject query parameter into a dense slice by allocating entries from zero through the largest supplied index, after which buildResObj creates another slice of the same length. This allocation occurs before schema validation, so maxItems does not prevent it. An unauthenticated client can send a small query such as param[items][50000000]=x to an endpoint whose deepObject schema contains an array, forcing multi-gigabyte heap allocation and causing an OOM kill or restart loop. Other request-body encodings and styled parameters that do not produce bracketed integer indexes are not affected. This issue is fixed in version 0.142.0.

CVSS v3
8.7
EG Score
8.7HIGHmedium confidence
EG Risk
70
EG Risk 70/100CISA SSVC

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
Severity87% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

v0.142.0

Patch available: getkin/kin-openapi v0.142.0

https://github.com/getkin/kin-openapi/releases/tag/v0.142.0
github_commit Patch Available

commit 1223a0f215d2 (getkin/kin-openapi)

Patch available: getkin/kin-openapi v0.142.0 (contains commit 1223a0f215d2)

https://github.com/getkin/kin-openapi/commit/1223a0f215d2cf9beb2d9eb9ea2649d001c21388
github_pr Patch Available

openapi3filter: deepObject array of objects and array of arrays support

Patch available: getkin/kin-openapi v0.124.0 (PR #923 merged 2024-03-22)

https://github.com/getkin/kin-openapi/pull/923
githubMentions a patch (unverified)🟡 PoC Available

Uncontrolled resource consumption in openapi3filter deepObject query parameter decoding · Advisory · getkin/kin-openapi · GitHub

https://github.com/getkin/kin-openapi/security/advisories/GHSA-xhj3-7xw9-vr34

Vendor Advisories for CVE-2026-77354(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-getkin-kin-openapi0.110.0-1 ... 0.135.0-1 (10 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-getkin-kin-openapi0.124.0-1, 0.135.0-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
golang-github-getkin-kin-openapi0.124.0-1, 0.135.0-1
  • every version on: no fix on record
—
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/getkin/kin-openapi—
  • 0.124.0 up to 0.142.0: fixed in 0.142.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 52× 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. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-09 05:45 UTCEG score recompute
  4. 2026-10-08 17:13 UTCEPSS rescore
  5. 2026-10-08 04:52 UTCEG score recompute
  6. 2026-10-07 23:48 UTCEPSS rescore
  7. 2026-10-06 16:49 UTCEG score recompute
  8. 2026-10-06 15:18 UTCEPSS rescore
  9. 2026-10-06 03:03 UTCEG score recompute
  10. 2026-10-05 17:43 UTCEPSS rescore
  11. 2026-10-05 09:54 UTCEG score recompute
  12. 2026-10-04 23:22 UTCEPSS rescore
  13. 2026-10-03 17:16 UTCEG score recompute
  14. 2026-10-03 14:26 UTCEPSS rescore
  15. 2026-10-03 04:08 UTCEG score recompute
  16. 2026-10-02 01:19 UTCEG score recompute
  17. 2026-10-01 19:50 UTCEPSS rescore
  18. 2026-09-30 20:55 UTCEG score recompute
  19. 2026-09-29 15:38 UTCEG score recompute
  20. 2026-09-29 15:24 UTCEPSS rescore
  21. 2026-09-28 21:35 UTCEG score recompute
  22. 2026-09-27 15:47 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescore
  24. 2026-09-27 02:25 UTCEG score recompute
  25. 2026-09-26 15:59 UTCEPSS rescore
Show 67 more
  1. 2026-09-26 00:28 UTCEPSS rescore
  2. 2026-09-24 19:00 UTCEG score recompute
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 04:38 UTCEG score recompute
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 02:25 UTCEG score recompute
  7. 2026-09-22 16:01 UTCEPSS rescore
  8. 2026-09-22 00:12 UTCEG score recompute
  9. 2026-09-21 21:09 UTCEPSS rescore
  10. 2026-09-20 22:01 UTCEG score recompute
  11. 2026-09-20 20:16 UTCEPSS rescore
  12. 2026-09-19 18:43 UTCEG score recompute
  13. 2026-09-19 05:38 UTCEG score recompute
  14. 2026-09-18 19:28 UTCEPSS rescore
  15. 2026-09-18 02:37 UTCEG score recompute
  16. 2026-09-17 00:22 UTCEG score recompute
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 11:16 UTCEG score recompute
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-15 09:04 UTCEG score recompute
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-13 17:47 UTCEG score recompute
  23. 2026-09-12 15:34 UTCEG score recompute
  24. 2026-09-12 15:02 UTCEPSS rescore
  25. 2026-09-12 02:28 UTCEG score recompute
  26. 2026-09-11 14:53 UTCEPSS rescore
  27. 2026-09-11 13:22 UTCEG score recompute
  28. 2026-09-10 10:26 UTCEG score recompute
  29. 2026-09-10 09:35 UTCEPSS rescore
  30. 2026-09-09 01:45 UTCEG score recompute
  31. 2026-09-08 22:01 UTCEPSS rescore
  32. 2026-09-08 04:34 UTCEG score recompute
  33. 2026-09-06 23:10 UTCEG score recompute
  34. 2026-09-06 13:48 UTCEPSS rescore
  35. 2026-09-05 20:59 UTCEG score recompute
  36. 2026-09-04 18:47 UTCEG score recompute
  37. 2026-09-04 05:17 UTCEG score recompute
  38. 2026-09-04 05:07 UTCEPSS rescore
  39. 2026-09-03 03:02 UTCEG score recompute
  40. 2026-09-02 14:12 UTCEPSS rescore
  41. 2026-09-02 00:19 UTCEG score recompute
  42. 2026-09-01 13:54 UTCEPSS rescore
  43. 2026-09-01 11:09 UTCEG score recompute
  44. 2026-09-01 04:40 UTCEPSS rescore
  45. 2026-09-01 04:40 UTCEPSS rescore
  46. 2026-08-30 19:47 UTCEG score recompute
  47. 2026-08-30 19:18 UTCEPSS rescore
  48. 2026-08-30 19:17 UTCEPSS rescore
  49. 2026-08-30 06:42 UTCEG score recompute
  50. 2026-08-30 01:22 UTCEPSS rescore
  51. 2026-08-29 03:19 UTCEG score recompute
  52. 2026-08-28 21:42 UTCEPSS rescore
  53. 2026-08-28 01:06 UTCEG score recompute
  54. 2026-08-27 14:25 UTCEPSS rescore
  55. 2026-08-26 22:53 UTCEG score recompute
  56. 2026-08-26 14:47 UTCEPSS rescore
  57. 2026-08-25 20:37 UTCEG score recompute
  58. 2026-08-25 19:25 UTCEG score recompute
  59. 2026-08-25 17:09 UTCEG score recompute
  60. 2026-08-25 13:49 UTCEPSS rescore
  61. 2026-08-24 14:57 UTCEG score recompute
  62. 2026-08-24 14:18 UTCEPSS rescore
  63. 2026-08-23 12:41 UTCEG score recompute
  64. 2026-08-23 00:19 UTCEPSS rescore
  65. 2026-08-21 21:24 UTCEG score recompute
  66. 2026-08-21 20:55 UTCEG score recompute
  67. 2026-08-21 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-77354?
CVE-2026-77354 is a high vulnerability published on August 21, 2026. kin-openapi is a Go project for handling OpenAPI files. From 0.124.0 until 0.142.0, openapi3filter.sliceMapToSlice in openapi3filter/reqrespdecoder.go converts attacker-controlled sparse indexes from a deepObject query parameter into a dense slice by allocating entries from zero through the largest…
When was CVE-2026-77354 disclosed?
CVE-2026-77354 was first published on August 21, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77354 actively exploited?
CVE-2026-77354 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77354?
CVE-2026-77354 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77354?
A fix for CVE-2026-77354 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-77354 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-77354

Explore →

Is Your Infrastructure Affected by CVE-2026-77354?

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

Book a Demo →Browse All CVEs