CVE-2026-95508

HIGHPre-NVD 7.47.4
EchelonGraph scoreMEDIUM confidence

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

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-22. A secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-84336 (ENISA EUVD) · GHSA-3qjr-gg7g-qcrr (GitHub Security Advisories)Source: ENISA EUVD

7.4EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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)
Severity74% × 45%
Impact severity (EG Severity): CVSS 7.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.6%
EPSS %ILE
47th
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 (7.4): severity, escalated by confirmed exploitation. This CVE's 7.4 is its impact severity (EG Severity), not escalated.

EG Severity
7.4 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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

September 22, 2026

Last Modified

November 6, 2026

Advisory Details (2)

Auto-updated Sep 22, 2026
Patch available. Sources: redhat.
Red Hat

2537748 – (CVE-2026-95508) CVE-2026-95508 libslirp: libslirp: heap buffer overflow in DHCPv6/TFTP response builders on small interface MTU

https://bugzilla.redhat.com/show_bug.cgi?id=2537748
Red HatMentions a patch (unverified)

CVE-2026-95508 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-95508

Vendor Advisories for CVE-2026-95508(2)

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 rangeFix by version rangeDependents
libslirp4.7.0-1 ... 4.9.5-1 (7 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libslirp4.8.0-1 ... 4.9.5-1 (7 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libslirp4.8.0-1, 4.9.1-1, 4.9.2-1, 4.9.3-1, 4.9.4-1
  • every version up to 4.9.5-1: fixed in 4.9.5-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 42× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 182 rows 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 82 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-11-12 14:31 UTCEchelonGraph re-scored
  3. 2026-11-12 14:31 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  4. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  5. 2026-11-10 16:46 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  7. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  9. 2026-11-06 16:40 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-11-06 03:27 UTCEchelonGraph re-scored
  11. 2026-11-06 03:27 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  12. 2026-11-06 02:28 UTCEchelonGraph re-scored
  13. 2026-11-06 02:28 UTCVendor advisory
  14. 2026-11-06 02:28 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  15. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-11-03 05:26 UTCEchelonGraph re-scored
  19. 2026-11-03 05:26 UTCVendor advisory
  20. 2026-11-03 05:26 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  21. 2026-11-03 04:32 UTCEchelonGraph re-scored
  22. 2026-11-03 04:32 UTCVendor advisory
  23. 2026-11-03 04:32 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  24. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  25. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.6% · 47th percentile
Show 75 more
  1. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  4. 2026-10-29 01:50 UTCEchelonGraph re-scored
  5. 2026-10-29 01:49 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  7. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  9. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-10-25 13:48 UTCEchelonGraph re-scored
  11. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  12. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-10-22 09:33 UTCEchelonGraph re-scored
  15. 2026-10-22 09:32 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  16. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  17. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  19. 2026-10-19 15:17 UTCEchelonGraph re-scored
  20. 2026-10-19 15:17 UTCVendor advisory
  21. 2026-10-19 15:17 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  22. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  23. 2026-10-18 02:57 UTCEchelonGraph re-scored
  24. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  25. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  26. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  27. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  28. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  29. 2026-10-13 04:12 UTCEchelonGraph re-scored
  30. 2026-10-13 04:12 UTCVendor advisory
  31. 2026-10-13 04:12 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  32. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  33. 2026-10-12 14:41 UTCEchelonGraph re-scored
  34. 2026-10-12 01:41 UTCVendor advisory
  35. 2026-10-12 01:41 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  36. 2026-10-11 19:11 UTCEchelonGraph re-scored
  37. 2026-10-11 16:27 UTCEchelonGraph re-scored
  38. 2026-10-11 14:06 UTCEchelonGraph re-scored
  39. 2026-10-11 14:06 UTCVendor advisory
  40. 2026-10-11 14:06 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  41. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  42. 2026-10-11 13:39 UTCEchelonGraph re-scored
  43. 2026-10-11 02:42 UTCEchelonGraph re-scored
  44. 2026-10-11 02:42 UTCVendor advisory
  45. 2026-10-11 02:42 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  46. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  47. 2026-10-10 14:50 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  48. 2026-10-10 03:27 UTCEchelonGraph re-scored
  49. 2026-10-10 03:27 UTCVendor advisory
  50. 2026-10-10 03:27 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  51. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  52. 2026-10-09 16:04 UTCVendor advisory
  53. 2026-10-09 16:04 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  54. 2026-10-09 04:40 UTCVendor advisory
  55. 2026-10-09 04:40 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  56. 2026-10-08 17:17 UTCEchelonGraph re-scored
  57. 2026-10-08 17:17 UTCVendor advisory
  58. 2026-10-08 17:16 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  59. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  60. 2026-10-08 02:35 UTCEchelonGraph re-scored
  61. 2026-10-08 02:35 UTCVendor advisory
  62. 2026-10-08 02:35 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  63. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  64. 2026-10-07 15:12 UTCVendor advisory
  65. 2026-10-07 15:12 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  66. 2026-10-07 03:45 UTCVendor advisory
  67. 2026-10-07 03:45 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  68. 2026-10-06 16:22 UTCEchelonGraph re-scored
  69. 2026-10-06 16:22 UTCVendor advisory
  70. 2026-10-06 16:22 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  71. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  72. 2026-10-06 04:56 UTCEchelonGraph re-scored
  73. 2026-10-06 04:56 UTCVendor advisory
  74. 2026-10-06 04:56 UTCGHSA enrichmentGHSA-3qjr-gg7g-qcrr · GitHub severity HIGH · GitHub CVSS 7.4
  75. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.6% · 45th percentile

Frequently asked(5)

What is CVE-2026-95508?
CVE-2026-95508 is a high-severity vulnerability; its CVE record was published on September 22, 2026. A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in…
When was CVE-2026-95508 made public?
CVE-2026-95508 was made public on September 22, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on September 22, 2026. EchelonGraph's copy of the record carries a last-modified date of November 6, 2026; the record at its source may have been updated since.
Is CVE-2026-95508 actively exploited?
CVE-2026-95508 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-95508?
CVE-2026-95508 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-95508?
A fix for CVE-2026-95508 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-95508 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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