CVE-2026-57053

MEDIUMNVD 2.54.0▲
EchelonGraph scoreMEDIUM confidence

Score 4.0 from GitHub Security Advisory published 2026-06-23. NVD baseline CVSS 2.5; sources differ by 1.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
4.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 2.5Exploit: None knownExposed: 0

A fix is available — apply it.

GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode APIs because of mishandling in idna_to_unicode_internal. The affected code is not present in libidn2.

CVSS v3
2.5
EG Score
4.0(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity40% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

June 23, 2026

Last Modified

June 29, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

GNU Libidn Security Advisory: Read out of bounds in ToUnicode APIs

https://lists.gnu.org/archive/html/help-libidn/2026-06/msg00001.html
generic

Security issue: Libidn ToUnicode round-trip verification reads uninitial

https://lists.gnu.org/archive/html/help-libidn/2026-05/msg00000.html

Vendor Advisories for CVE-2026-57053(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibidn12 (1.43-2ubuntu0.26.04.1) @ resolute2026-07-26ubuntu

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.

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 16× in last 7d / 64× 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.

  1. 2026-07-27 17:46 UTCEG score recompute
  2. 2026-07-27 17:46 UTCGHSA enrichment
  3. 2026-07-27 14:14 UTCEPSS rescore
  4. 2026-07-26 15:52 UTCEG score recompute
  5. 2026-07-26 15:52 UTCVendor advisory
  6. 2026-07-26 15:52 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-25 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-24 14:18 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 03:20 UTCEG score recompute
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-21 15:25 UTCEPSS rescore
  17. 2026-07-20 17:08 UTCEPSS rescore
  18. 2026-07-19 14:31 UTCEPSS rescore
  19. 2026-07-19 14:31 UTCEPSS rescore
  20. 2026-07-19 02:29 UTCEPSS rescore
  21. 2026-07-16 17:03 UTCEPSS rescore
  22. 2026-07-16 09:59 UTCVendor advisory
  23. 2026-07-16 09:59 UTCGHSA enrichment
  24. 2026-07-15 16:57 UTCEPSS rescore
  25. 2026-07-15 16:57 UTCEPSS rescore
Show 48 more
  1. 2026-07-15 10:25 UTCGHSA enrichment
  2. 2026-07-14 10:51 UTCGHSA enrichment
  3. 2026-07-13 22:31 UTCEPSS rescore
  4. 2026-07-13 11:17 UTCVendor advisory
  5. 2026-07-13 11:17 UTCGHSA enrichment
  6. 2026-07-12 11:44 UTCVendor advisory
  7. 2026-07-12 11:44 UTCGHSA enrichment
  8. 2026-07-12 05:46 UTCEPSS rescore
  9. 2026-07-11 12:10 UTCVendor advisory
  10. 2026-07-11 12:10 UTCGHSA enrichment
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-10 12:36 UTCGHSA enrichment
  14. 2026-07-09 19:10 UTCEPSS rescore
  15. 2026-07-09 19:10 UTCEPSS rescore
  16. 2026-07-09 12:53 UTCGHSA enrichment
  17. 2026-07-08 13:15 UTCGHSA enrichment
  18. 2026-07-07 13:46 UTCEPSS rescore
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-07 13:40 UTCGHSA enrichment
  21. 2026-07-06 14:06 UTCGHSA enrichment
  22. 2026-07-06 02:23 UTCEPSS rescore
  23. 2026-07-06 02:23 UTCEPSS rescore
  24. 2026-07-05 14:31 UTCGHSA enrichment
  25. 2026-07-05 02:31 UTCEPSS rescore
  26. 2026-07-05 02:30 UTCEPSS rescore
  27. 2026-07-04 14:58 UTCGHSA enrichment
  28. 2026-07-04 06:31 UTCEPSS rescore
  29. 2026-07-04 06:31 UTCEPSS rescore
  30. 2026-07-03 15:24 UTCGHSA enrichment
  31. 2026-07-02 15:51 UTCGHSA enrichment
  32. 2026-07-01 16:17 UTCGHSA enrichment
  33. 2026-07-01 15:07 UTCEPSS rescore
  34. 2026-06-30 23:22 UTCEPSS rescore
  35. 2026-06-30 16:44 UTCGHSA enrichment
  36. 2026-06-29 20:05 UTCNVD updateCVSS v3 → 2.5 · severity → LOW
  37. 2026-06-29 17:11 UTCGHSA enrichment
  38. 2026-06-28 17:32 UTCGHSA enrichment
  39. 2026-06-28 14:07 UTCEPSS rescore
  40. 2026-06-27 17:58 UTCGHSA enrichment
  41. 2026-06-27 03:08 UTCEPSS rescore
  42. 2026-06-26 18:25 UTCGHSA enrichment
  43. 2026-06-25 18:52 UTCGHSA enrichment
  44. 2026-06-25 13:49 UTCEPSS rescore
  45. 2026-06-24 19:18 UTCGHSA enrichment
  46. 2026-06-24 14:05 UTCEPSS rescore
  47. 2026-06-23 19:20 UTCEG score recompute
  48. 2026-06-23 19:20 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-57053?
CVE-2026-57053 is a medium vulnerability published on June 23, 2026. GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode APIs because of mishandling in idnatounicode_internal. The affected code is not present in libidn2.
When was CVE-2026-57053 disclosed?
CVE-2026-57053 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57053 actively exploited?
CVE-2026-57053 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 95.6% of all scored CVEs.
What is the CVSS score of CVE-2026-57053?
CVE-2026-57053 has a CVSS v3 base score of 2.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 4.0.
How do I remediate CVE-2026-57053?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57053, 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

Explore the affected products and dependency analysis for CVE-2026-57053

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