CVE-2026-73523

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-17. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

COVESA Open1722 through 0.9.2 contains an integer truncation vulnerability in acf-can-listener.c that allows unauthenticated remote attackers to cause the CAN listener to transmit process stack memory onto the CAN bus by sending a rejected UDP datagram with a matching AVTP stream ID. The num_can_msgs variable declared as uint8_t truncates the -1 error return value from avtp_to_can() to 255, causing a write loop to iterate 255 times over a 15-slot stack array and leak approximately 18 KB of adjacent stack memory as roughly 240 CAN frames to any recipient on the CAN bus.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (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 17, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

COVESA Open1722 0.9.2 Stack Memory Disclosure via acf-can-listener.c Integer Truncation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/covesa-open1722-stack-memory-disclosure-via-acf-can-listener-c-integer-truncation
generic

acf-can-listener: stack buffer overflow and stack memory disclosure from one UDP datagram (CVE-2026-73522, CVE-2026-73523) · Issue #154 · COVESA/Open1722 · GitHub

https://github.com/COVESA/Open1722/issues/154

Vendor Advisories for CVE-2026-73523(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 94× 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.

Showing the most recent 100 of 167 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73523?
CVE-2026-73523 is a high vulnerability published on August 17, 2026. COVESA Open1722 through 0.9.2 contains an integer truncation vulnerability in acf-can-listener.c that allows unauthenticated remote attackers to cause the CAN listener to transmit process stack memory onto the CAN bus by sending a rejected UDP datagram with a matching AVTP stream ID. The numcanmsgs…
When was CVE-2026-73523 disclosed?
CVE-2026-73523 was first published on August 17, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73523 actively exploited?
CVE-2026-73523 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73523?
CVE-2026-73523 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73523?
No fix for CVE-2026-73523 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-73523 are linked in the Vendor Advisories panel on this page.

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