CVE-2026-57053

LOWNVD 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
2.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 2.5Exploit: NoneExposed: 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
1.5%
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) @ resolute2026-07-16ubuntu

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 8× in last 7d / 60× 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. 2026-07-23 03:20 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 02:29 UTCEPSS rescore
  8. 2026-07-16 17:03 UTCEPSS rescore
  9. 2026-07-16 09:59 UTCVendor advisory
  10. 2026-07-16 09:59 UTCGHSA enrichment
  11. 2026-07-15 16:57 UTCEPSS rescore
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-15 10:25 UTCGHSA enrichment
  14. 2026-07-14 10:51 UTCGHSA enrichment
  15. 2026-07-13 22:31 UTCEPSS rescore
  16. 2026-07-13 11:17 UTCVendor advisory
  17. 2026-07-13 11:17 UTCGHSA enrichment
  18. 2026-07-12 11:44 UTCVendor advisory
  19. 2026-07-12 11:44 UTCGHSA enrichment
  20. 2026-07-12 05:46 UTCEPSS rescore
  21. 2026-07-11 12:10 UTCVendor advisory
  22. 2026-07-11 12:10 UTCGHSA enrichment
  23. 2026-07-11 08:27 UTCEPSS rescore
  24. 2026-07-11 08:27 UTCEPSS rescore
  25. 2026-07-10 12:36 UTCGHSA enrichment
Show 35 more
  1. 2026-07-09 19:10 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-09 12:53 UTCGHSA enrichment
  4. 2026-07-08 13:15 UTCGHSA enrichment
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-07 13:46 UTCEPSS rescore
  7. 2026-07-07 13:40 UTCGHSA enrichment
  8. 2026-07-06 14:06 UTCGHSA enrichment
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-06 02:23 UTCEPSS rescore
  11. 2026-07-05 14:31 UTCGHSA enrichment
  12. 2026-07-05 02:31 UTCEPSS rescore
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-04 14:58 UTCGHSA enrichment
  15. 2026-07-04 06:31 UTCEPSS rescore
  16. 2026-07-04 06:31 UTCEPSS rescore
  17. 2026-07-03 15:24 UTCGHSA enrichment
  18. 2026-07-02 15:51 UTCGHSA enrichment
  19. 2026-07-01 16:17 UTCGHSA enrichment
  20. 2026-07-01 15:07 UTCEPSS rescore
  21. 2026-06-30 23:22 UTCEPSS rescore
  22. 2026-06-30 16:44 UTCGHSA enrichment
  23. 2026-06-29 20:05 UTCNVD updateCVSS v3 → 2.5 · severity → LOW
  24. 2026-06-29 17:11 UTCGHSA enrichment
  25. 2026-06-28 17:32 UTCGHSA enrichment
  26. 2026-06-28 14:07 UTCEPSS rescore
  27. 2026-06-27 17:58 UTCGHSA enrichment
  28. 2026-06-27 03:08 UTCEPSS rescore
  29. 2026-06-26 18:25 UTCGHSA enrichment
  30. 2026-06-25 18:52 UTCGHSA enrichment
  31. 2026-06-25 13:49 UTCEPSS rescore
  32. 2026-06-24 19:18 UTCGHSA enrichment
  33. 2026-06-24 14:05 UTCEPSS rescore
  34. 2026-06-23 19:20 UTCEG score recompute
  35. 2026-06-23 19:20 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-57053?
CVE-2026-57053 is a low 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 1.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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

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