CVE-2026-80212

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. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — Patch released this week

Also known asEUVD-2026-67138 (ENISA EUVD) · GHSA-x2vh-ff4w-v64c (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: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An issue was discovered in the resolv gem before 0.7.2 for Ruby. Resolv::DNS::Resource.get_class, Resolv::DNS::Resource::Generic.create, and Resolv::DNS::SvcParam::Generic.create generate a new class for each unknown DNS resource record (type, class) pair, or each unknown SvcParamKey, encountered while decoding a response. Each generated class was permanently registered both as a constant on Resource (or SvcParam::Generic) and as an entry in a class-lookup hash (ClassHash), and thus the class remained reachable through that constant after the response was discarded. Type and class are each 16-bit values, and thus an attacker controlling DNS responses (a spoofed response, or a malicious or hijacked upstream DNS server) has roughly 2^32 distinct (type, class) pairs to choose from. A single response of a few hundred kilobytes carrying tens of thousands of distinct unknown types permanently grows process memory by tens of megabytes; repeated responses accumulate without bound and are never reclaimed by garbage collection, because the constant keeps each class alive. Any code path that calls Resolv::DNS::Message.decode on attacker-influenced DNS responses is affected. resolv is a default gem, and thus this is reachable from a plain Ruby installation without any additional dependency.

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.
Exploitation0.4% × 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
0.4%
EPSS %ILE
34th
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
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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, and whom BOD 26-04 binds: 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.

The score's inputs: 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 9, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
Patch available.
Web page

Security advisories: CVE-2026-80212 and CVE-2026-80213 | Ruby

https://www.ruby-lang.org/en/news/2026/08/27/multiple-vulnerabilities-in-resolv/
Web page

GitHub - ruby/resolv: A thread-aware DNS resolver library written in Ruby · GitHub

https://github.com/ruby/resolv

Patch Availability(22)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatruby-0:2.0.0.648-40.el7_92026-11-09redhat
redhatruby:2.5-8040020261007063956.522a0ee42026-11-05redhat
redhatruby:2.5-8060020261006170103.ad008a3a2026-11-05redhat
redhatruby:2.5-8080020261006163955.63b345852026-11-05redhat
redhatruby:3.3-9040020260925105409.92026-10-20redhat
redhatruby:3.3-9060020260925110613.92026-10-20redhat
redhatruby-0:3.0.7-163.el9_42026-10-15redhat
redhatruby-0:3.0.4-162.el9_22026-10-15redhat
redhatruby-0:3.3.12-12.el10_02026-10-15redhat
redhatruby-0:3.0.7-166.el9_62026-10-15redhat
redhatruby-0:3.3.12-15.el10_22026-10-02redhat
redhatruby:2.5-8100020260923114349.489197e62026-09-30redhat
redhatruby:3.3-9080020260909091103.92026-09-28redhat
redhatruby-0:3.0.7-168.el9_82026-09-28redhat
redhatruby:3.3-8100020260909091101.489197e62026-09-28redhat
redhatruby:4.0-9080020260909091105.92026-09-28redhat
redhatruby4.0-0:4.0.6-37.el10_22026-09-28redhat
redhatruby3-3-main-3.3.10-23.6.hum12026-09-02redhat
redhatruby4-0-main-4.0.6-37.3.hum12026-09-02redhat
redhatruby3-4-main-3.4.10-31.6.hum12026-08-21redhat
redhatruby3-3-main-3.3.10-23.5.hum12026-08-21redhat
redhatruby4-0-main-4.0.6-37.2.hum12026-08-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
ruby—
  • every version up to 3.3.13-r0: fixed in 3.3.13-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
ruby—
  • every version up to 3.4.12-r0: fixed in 3.4.12-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
ruby—
  • every version up to 3.4.12-r0: fixed in 3.4.12-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
ruby—
  • every version up to 3.4.12-r0: fixed in 3.4.12-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ruby3.13.1.2-7 ... 3.1.2-8.5 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ruby3.33.3.8-2, 3.3.8-2.1, 3.3.8-2.2
  • every version up to 3.3.13-0+deb13u1: fixed in 3.3.13-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ruby3.33.3.8-2, 3.3.8-2.1, 3.3.8-2.2
  • every version on: no fix on record
—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 39× 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 293 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 193 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:57 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  2. 2026-11-13 05:06 UTCEchelonGraph re-scored
  3. 2026-11-13 05:06 UTCVendor advisory
  4. 2026-11-13 05:06 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  5. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  6. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  7. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  8. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  9. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  12. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  13. 2026-11-05 13:30 UTCEchelonGraph re-scored
  14. 2026-11-05 13:30 UTCVendor advisory
  15. 2026-11-05 13:30 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  18. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  22. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-10-28 21:52 UTCEchelonGraph re-scored
  24. 2026-10-28 21:52 UTCVendor advisory
  25. 2026-10-28 21:52 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
Show 75 more
  1. 2026-10-28 19:55 UTCOSV refresh
  2. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  4. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  5. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  6. 2026-10-25 13:59 UTCEchelonGraph re-scored
  7. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  8. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-10-20 22:11 UTCEchelonGraph re-scored
  12. 2026-10-20 22:11 UTCVendor advisory
  13. 2026-10-20 22:11 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  15. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  17. 2026-10-18 03:10 UTCEchelonGraph re-scored
  18. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  19. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  20. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  21. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  22. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-10-13 06:32 UTCEchelonGraph re-scored
  24. 2026-10-13 06:32 UTCVendor advisory
  25. 2026-10-13 06:31 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  26. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  27. 2026-10-12 14:57 UTCEchelonGraph re-scored
  28. 2026-10-11 19:21 UTCEchelonGraph re-scored
  29. 2026-10-11 16:37 UTCEchelonGraph re-scored
  30. 2026-10-11 13:56 UTCEchelonGraph re-scored
  31. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  32. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  33. 2026-10-10 14:21 UTCVendor advisory
  34. 2026-10-10 14:21 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  35. 2026-10-10 01:56 UTCEchelonGraph re-scored
  36. 2026-10-10 01:56 UTCVendor advisory
  37. 2026-10-10 01:56 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  38. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  39. 2026-10-09 03:08 UTCEchelonGraph re-scored
  40. 2026-10-09 03:08 UTCVendor advisory
  41. 2026-10-09 03:08 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  43. 2026-10-08 01:21 UTCEchelonGraph re-scored
  44. 2026-10-08 01:21 UTCVendor advisory
  45. 2026-10-08 01:21 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  46. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  47. 2026-10-07 09:06 UTCVendor advisory
  48. 2026-10-07 09:06 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  49. 2026-10-06 20:42 UTCEchelonGraph re-scored
  50. 2026-10-06 20:42 UTCVendor advisory
  51. 2026-10-06 20:41 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  53. 2026-10-06 07:33 UTCEchelonGraph re-scored
  54. 2026-10-06 07:33 UTCVendor advisory
  55. 2026-10-06 07:33 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  57. 2026-10-05 16:54 UTCVendor advisory
  58. 2026-10-05 16:54 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-10-05 04:36 UTCEchelonGraph re-scored
  60. 2026-10-05 04:36 UTCVendor advisory
  61. 2026-10-05 04:36 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  62. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  63. 2026-10-04 15:58 UTCVendor advisory
  64. 2026-10-04 15:58 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  65. 2026-10-04 03:32 UTCVendor advisory
  66. 2026-10-04 03:32 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-10-03 15:14 UTCEchelonGraph re-scored
  68. 2026-10-03 15:14 UTCVendor advisory
  69. 2026-10-03 15:14 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  71. 2026-10-02 21:31 UTCEchelonGraph re-scored
  72. 2026-10-02 21:31 UTCVendor advisory
  73. 2026-10-02 21:31 UTCGHSA enrichmentGHSA-x2vh-ff4w-v64c · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  75. 2026-10-02 09:08 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-80212?
CVE-2026-80212 is a high-severity vulnerability; its CVE record was published on August 27, 2026. An issue was discovered in the resolv gem before 0.7.2 for Ruby. Resolv::DNS::Resource.get_class, Resolv::DNS::Resource::Generic.create, and Resolv::DNS::SvcParam::Generic.create generate a new class for each unknown DNS resource record (type, class) pair, or each unknown SvcParamKey, encountered…
When was the CVE record for CVE-2026-80212 published?
The CVE record for CVE-2026-80212 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 9, 2026; the record at its source may have been updated since.
Is CVE-2026-80212 actively exploited?
CVE-2026-80212 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-80212?
CVE-2026-80212 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-80212?
A fix for CVE-2026-80212 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-80212 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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