CVE-2026-48688

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-26. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-31844 (ENISA EUVD) · GHSA-rxgw-72v4-4rvj (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MP_REACH_NLRI IPv6 attribute decoder. The function decode_mp_reach_ipv6() in src/bgp_protocol.cpp contains a TODO comment at line 156 explicitly acknowledging 'we should add sanity checks to avoid reads after attribute memory block.' The function casts raw pointers to structure types without verifying sufficient data exists (line 158), uses the attacker-controlled length_of_next_hop field to determine memcpy size (line 181), and computes prefix_length by dereferencing a pointer calculated from multiple attacker-controlled offsets without bounds validation (line 189). The prefix_length is then used to calculate number_of_bytes_required_for_prefix which becomes a memcpy length (line 202) with no check against remaining buffer size.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
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 none (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: 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
0.3%
EPSS %ILE
20th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-30). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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 none (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

May 26, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jun 7, 2026
Patch available.
Web page

CVE-2026-48688: FastNetMon BGP MP_REACH_NLRI IPv6 Decoder Has an Acknowledged TODO | Lorikeet Security

https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48688-bgp-mp-reach-nlri-ipv6
Web page

fastnetmon/src/bgp_protocol.cpp at master · pavel-odintsov/fastnetmon · GitHub

https://github.com/pavel-odintsov/fastnetmon/blob/master/src/bgp_protocol.cpp
Web page

GitHub - pavel-odintsov/fastnetmon: Very fast DDoS sensor with sFlow/Netflow/IPFIX/SPAN support · GitHub

https://github.com/pavel-odintsov/fastnetmon

Vendor Advisories for CVE-2026-48688(1)

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

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
fastnetmon1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-1
  • every version up to 1.2.9-0+deb13u1: fixed in 1.2.9-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
fastnetmon1.2.8+git20250911-1, 1.2.8+git20250911-2, 1.2.8-1
  • every version up to 1.2.9-1: fixed in 1.2.9-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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 100 of 273 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. None are among the latest 100 rows. The 173 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-31 02:40 UTCEG score recompute
  2. 2026-10-31 02:40 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  4. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  6. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  7. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-10-25 14:23 UTCEG score recompute
  10. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-24 07:28 UTCEG score recompute
  12. 2026-10-24 07:28 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  18. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  19. 2026-10-18 03:34 UTCEG score recompute
  20. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-17 12:16 UTCEG score recompute
  22. 2026-10-17 12:16 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  23. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 75 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-12 16:00 UTCEG score recompute
  4. 2026-10-11 19:43 UTCEG score recompute
  5. 2026-10-11 16:58 UTCEG score recompute
  6. 2026-10-11 14:22 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-09-30 02:10 UTCOSV refresh
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  27. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  28. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  30. 2026-09-11 03:23 UTCOSV refresh
  31. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  32. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  33. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  35. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  36. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  37. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  38. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  39. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  40. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  41. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  42. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  43. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  44. 2026-08-23 16:26 UTCEG score recompute
  45. 2026-08-23 16:26 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  46. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  47. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-08-21 21:32 UTCEG score recompute
  49. 2026-08-21 21:32 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  51. 2026-08-20 18:21 UTCEG score recompute
  52. 2026-08-20 18:21 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  54. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  55. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  56. 2026-08-17 09:36 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  57. 2026-08-16 16:45 UTCEG score recompute
  58. 2026-08-16 16:45 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  60. 2026-08-16 03:10 UTCEG score recompute
  61. 2026-08-16 03:10 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  62. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  63. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  64. 2026-08-15 00:03 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  65. 2026-08-14 12:54 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  66. 2026-08-14 01:46 UTCEG score recompute
  67. 2026-08-14 01:46 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  68. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  69. 2026-08-13 10:42 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-08-12 23:09 UTCEG score recompute
  71. 2026-08-12 23:09 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  73. 2026-08-12 12:00 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-08-12 00:51 UTCEG score recompute
  75. 2026-08-12 00:51 UTCGHSA enrichmentGHSA-rxgw-72v4-4rvj · GitHub severity HIGH · GitHub CVSS 7.5

Frequently asked(5)

What is CVE-2026-48688?
CVE-2026-48688 is a high-severity vulnerability; its CVE record was published on May 26, 2026. FastNetMon Community Edition through 1.2.9 contains multiple out-of-bounds reads in the BGP MPREACHNLRI IPv6 attribute decoder. The function decodempreachipv6() in src/bgpprotocol.cpp contains a TODO comment at line 156 explicitly acknowledging 'we should add sanity checks to avoid reads after…
When was the CVE record for CVE-2026-48688 published?
The CVE record for CVE-2026-48688 was published on May 26, 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 July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-48688 actively exploited?
CVE-2026-48688 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48688?
CVE-2026-48688 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-48688?
A fix for CVE-2026-48688 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-48688 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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