CVE-2026-26457

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-27. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

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

ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 contains a null pointer dereference vulnerability in the coap_dump_msg() function when processing COAP messages containing options with zero length.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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: 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
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track 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 public PoC (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

August 27, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Sep 1, 2026
No fix on record yet.
Web page

bug_report/CoAP/ccoap/VULNERABILITY_REPORT2.md at master · songxpu/bug_report · GitHub

https://github.com/songxpu/bug_report/blob/master/CoAP/ccoap/VULNERABILITY_REPORT2.md
Web page

GitHub - ipflavors/ccoap: A CoAP library in C · GitHub

https://github.com/ipflavors/ccoap

Vendor Advisories for CVE-2026-26457(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 14× in last 7d / 88× 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 98 of 155 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 57 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-10-12 16:18 UTCEG score recompute
  7. 2026-10-11 20:00 UTCEG score recompute
  8. 2026-10-11 17:13 UTCEG score recompute
  9. 2026-10-11 14:45 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-10 05:49 UTCEG score recompute
  13. 2026-10-10 05:49 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-09 03:15 UTCEG score recompute
  16. 2026-10-09 03:15 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  17. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-08 01:27 UTCEG score recompute
  19. 2026-10-08 01:27 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-07 02:40 UTCEG score recompute
  22. 2026-10-07 02:40 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  23. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-10-06 13:48 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-10-06 00:59 UTCEG score recompute
Show 73 more
  1. 2026-10-06 00:58 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  2. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-05 08:30 UTCEG score recompute
  4. 2026-10-05 08:30 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  5. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-04 19:40 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-10-04 04:53 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  8. 2026-10-03 16:04 UTCEG score recompute
  9. 2026-10-03 16:04 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-03 01:40 UTCEG score recompute
  12. 2026-10-03 01:40 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-02 12:51 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-01 22:36 UTCEG score recompute
  15. 2026-10-01 22:36 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-01 08:46 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-09-30 19:57 UTCEG score recompute
  19. 2026-09-30 19:57 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-30 05:57 UTCEG score recompute
  22. 2026-09-30 05:57 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  23. 2026-09-29 12:45 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-09-28 23:56 UTCEG score recompute
  25. 2026-09-28 23:56 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  26. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  27. 2026-09-28 11:05 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  28. 2026-09-27 22:16 UTCEG score recompute
  29. 2026-09-27 22:16 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-09-27 09:27 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  31. 2026-09-26 20:28 UTCEG score recompute
  32. 2026-09-26 20:28 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  33. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  34. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  35. 2026-09-25 17:05 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  36. 2026-09-25 04:15 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-09-24 15:25 UTCEG score recompute
  38. 2026-09-24 15:25 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  39. 2026-09-24 02:14 UTCEG score recompute
  40. 2026-09-24 02:13 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-09-23 13:24 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-09-23 00:33 UTCEG score recompute
  43. 2026-09-23 00:33 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-09-22 11:43 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  45. 2026-09-21 22:54 UTCEG score recompute
  46. 2026-09-21 22:53 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-09-21 10:04 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  48. 2026-09-20 21:14 UTCEG score recompute
  49. 2026-09-20 21:14 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  51. 2026-09-20 08:24 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-09-19 18:04 UTCEG score recompute
  53. 2026-09-19 18:04 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  54. 2026-09-19 05:12 UTCEG score recompute
  55. 2026-09-19 05:12 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  57. 2026-09-18 16:21 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-09-18 03:26 UTCEG score recompute
  59. 2026-09-18 03:26 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  60. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  61. 2026-09-17 14:36 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  62. 2026-09-17 01:46 UTCEG score recompute
  63. 2026-09-17 01:46 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  65. 2026-09-16 12:57 UTCEG score recompute
  66. 2026-09-16 12:56 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  68. 2026-09-16 00:07 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  69. 2026-09-15 11:17 UTCEG score recompute
  70. 2026-09-15 11:17 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  71. 2026-09-14 22:27 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-09-14 09:37 UTCGHSA enrichmentGHSA-hpv9-cj7v-9vxp · GitHub severity HIGH · GitHub CVSS 7.5
  73. 2026-09-13 20:48 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-26457?
CVE-2026-26457 is a high-severity vulnerability; its CVE record was published on August 27, 2026. ccoap 77f55c4b466e99327c24ace8a2913d3ba7e2ccd5 contains a null pointer dereference vulnerability in the coapdumpmsg() function when processing COAP messages containing options with zero length.
When was the CVE record for CVE-2026-26457 published?
The CVE record for CVE-2026-26457 was published on August 27, 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 September 1, 2026; the record at its source may have been updated since.
Is CVE-2026-26457 actively exploited?
CVE-2026-26457 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-26457?
CVE-2026-26457 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-26457?
No fix for CVE-2026-26457 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-2026-26457 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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