CVE-2026-4046

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 2026-03-30. 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 — 4 sources updated this weekElevated
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).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application.

This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.

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 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.
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: 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
0.7%
EPSS %ILE
50th
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
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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 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

March 30, 2026

Last Modified

October 15, 2026

Advisory Details (4)

Auto-updated Jul 14, 2026
Patch available.
Web page

33980 – (CVE-2026-4046) iconv: ibm139x trigger assertion error when converting to internal while lack enough room (CVE-2026-4046)

https://sourceware.org/bugzilla/show_bug.cgi?id=33980
Web page

The GNU C Library security advisory update for 2026-03-30

https://inbox.sourceware.org/libc-announce/[email protected]/T/#u

Patch Availability(16)

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.31-13 ... 2.31-13+deb11u9 (14 versions)
  • every version up to 2.31-13+deb11u14: fixed in 2.31-13+deb11u14
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.36-9 ... 2.36-9+deb12u9 (14 versions)
  • every version up to 2.36-9+deb12u14: fixed in 2.36-9+deb12u14
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.41-12, 2.41-12+deb13u1, 2.41-12+deb13u2
  • every version up to 2.41-12+deb13u3: fixed in 2.41-12+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
glibc2.41-12 ... 2.42-9 (22 versions)
  • every version up to 2.42-15: fixed in 2.42-15
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 11× in last 7d / 35× 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 226 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 126 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  3. 2026-10-18 03:42 UTCEG score recompute
  4. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  5. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  6. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  7. 2026-10-15 01:37 UTCEG score recompute
  8. 2026-10-15 01:37 UTCVendor advisory
  9. 2026-10-15 01:37 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  10. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  11. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  12. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  13. 2026-10-12 16:09 UTCEG score recompute
  14. 2026-10-11 19:51 UTCEG score recompute
  15. 2026-10-11 17:05 UTCEG score recompute
  16. 2026-10-11 14:31 UTCEG score recompute
  17. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  18. 2026-10-11 04:01 UTCOSV refresh
  19. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  21. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  22. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  23. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  24. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  25. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 49th percentile
Show 75 more
  1. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  2. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  4. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  5. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  7. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  8. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-09-21 15:49 UTCOSV refresh
  10. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  11. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  12. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  13. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-09-02 12:44 UTCOSV refresh
  23. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  24. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  25. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  26. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  27. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  28. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  29. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  30. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  31. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  32. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  33. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  34. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  35. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  36. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  37. 2026-08-16 09:46 UTCEG score recompute
  38. 2026-08-16 09:46 UTCVendor advisory
  39. 2026-08-16 09:46 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  40. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  41. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  42. 2026-08-14 19:08 UTCVendor advisory
  43. 2026-08-14 19:08 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-08-14 06:08 UTCEG score recompute
  45. 2026-08-14 06:08 UTCVendor advisory
  46. 2026-08-14 06:08 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  48. 2026-08-12 20:29 UTCEG score recompute
  49. 2026-08-12 20:29 UTCVendor advisory
  50. 2026-08-12 20:29 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  51. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  52. 2026-08-11 20:39 UTCEG score recompute
  53. 2026-08-11 20:39 UTCVendor advisory
  54. 2026-08-11 20:39 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-08-11 03:40 UTCEG score recompute
  56. 2026-08-11 03:40 UTCVendor advisory
  57. 2026-08-11 03:40 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  59. 2026-08-10 05:21 UTCVendor advisory
  60. 2026-08-10 05:21 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  61. 2026-08-09 17:32 UTCEG score recompute
  62. 2026-08-09 17:32 UTCVendor advisory
  63. 2026-08-09 17:32 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  65. 2026-08-09 05:43 UTCEG score recompute
  66. 2026-08-09 05:43 UTCVendor advisory
  67. 2026-08-09 05:43 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  68. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  69. 2026-08-08 03:44 UTCEG score recompute
  70. 2026-08-08 03:44 UTCVendor advisory
  71. 2026-08-08 03:44 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-08-07 15:54 UTCVendor advisory
  73. 2026-08-07 15:53 UTCGHSA enrichmentGHSA-g7c4-wv7q-gcc6 · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-08-06 18:17 UTCEG score recompute
  75. 2026-08-06 18:17 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-4046?
CVE-2026-4046 is a high-severity vulnerability; its CVE record was published on March 30, 2026. The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application. This vulnerability can be trivially mitigated by removing the IBM1390 and…
When was CVE-2026-4046 made public?
CVE-2026-4046 was made public on March 12, 2026: that is the date its CVE record's CNA, GNU C Library, gives for when the vulnerability was made public. The CVE record itself was published on March 30, 2026. EchelonGraph's copy of the record carries a last-modified date of October 15, 2026; the record at its source may have been updated since.
Is CVE-2026-4046 actively exploited?
CVE-2026-4046 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (50th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-4046?
CVE-2026-4046 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-4046?
A fix for CVE-2026-4046 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-4046 are linked in the Vendor Advisories panel on this page.

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