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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

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
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 17, 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 24× in last 7d / 104× 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 118 total refreshes for this CVE.

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

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 in the National Vulnerability Database on August 17, 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% probability of exploitation in the next 30 days, which ranks it in the top 74.3% of all scored CVEs.
What is the CVSS score of CVE-2026-73523?
CVE-2026-73523 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-73523?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73523, 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

Explore the affected products and dependency analysis for CVE-2026-73523

Explore →

Is Your Infrastructure Affected by CVE-2026-73523?

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

Start Free Scan →Browse All CVEs