CVE-2026-29013

CRITICALPre-NVD 8.89.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-18. the CNA's CVSS baseline 8.8; sources differ by 1.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where get_byte_inc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with malformed OSCORE options or responses during OSCORE negotiation to trigger out-of-bounds reads during CBOR parsing and potentially cause out-of-bounds reads through integer wraparound in allocation size computation.

CVSS v3
8.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

April 17, 2026

Last Modified

July 14, 2026

Advisory Details (1)

Auto-updated Jun 20, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit b7847c4dbb0d (obgm/libcoap)

Fix landed in obgm/libcoap commit b7847c4dbb0d — awaiting tagged release

https://github.com/obgm/libcoap/commit/b7847c4dbb0dbee7c90b09a673d4cae256f03718

Vendor Advisories for CVE-2026-29013(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libcoap34.3.1-1 ... 4.3.5-4 (10 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libcoap34.3.4-1.1, 4.3.4-1.1+deb13u1, 4.3.4-1.1+deb13u24.3.4-1.1+deb13u3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libcoap34.3.4-1.1, 4.3.5-1, 4.3.5-24.3.5-3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 30× 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 262 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-29013?
CVE-2026-29013 is a critical vulnerability published on April 17, 2026. libcoap contains out-of-bounds read vulnerabilities in OSCORE Appendix B.2 CBOR unwrap handling where getbyteinc() in src/oscore/oscore_cbor.c relies solely on assert() for bounds checking, which is removed in release builds compiled with NDEBUG. Attackers can send crafted CoAP requests with…
When was CVE-2026-29013 disclosed?
CVE-2026-29013 was first published in the National Vulnerability Database on April 17, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-29013 actively exploited?
CVE-2026-29013 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 77.8% of all scored CVEs.
What is the CVSS score of CVE-2026-29013?
CVE-2026-29013 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-29013?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-29013, 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

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