CVE-2026-43894

MEDIUMNVD 6.26.2—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.2 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.2
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a 30-byte stack buffer, and then writes ≈715 million 16-bit units (≈1.4 GiB) at an offset 1.43 GiB below the stack frame. The written content is fully attacker-controlled (the parsed decimal digits, packed 3-per-unit).

CVSS v3
6.2
EG Score
6.2(medium)
EPSS
5.3%
KEV
Not listed

Published

May 11, 2026

Last Modified

May 13, 2026

Advisory Details (1)

Auto-updated May 11, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Wild stack write via signed-integer overflow in decNumber D2U() macro · Advisory · jqlang/jq · GitHub

https://github.com/jqlang/jq/security/advisories/GHSA-5v7p-2r57-2g4g

Vendor Advisories for CVE-2026-43894(2)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 46× 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. 2026-07-06 16:27 UTCEPSS rescore
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  10. 2026-06-27 09:46 UTCEG score recompute
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  1. 2026-06-16 17:52 UTCEPSS rescore
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  3. 2026-06-15 17:49 UTCEPSS rescore
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  5. 2026-06-13 23:00 UTCEPSS rescore
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  12. 2026-06-10 22:18 UTCEPSS rescore
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  15. 2026-06-10 07:58 UTCEG score recompute
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  17. 2026-06-08 14:17 UTCEPSS rescore
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  19. 2026-06-08 07:30 UTCEG score recompute
  20. 2026-06-07 15:25 UTCEPSS rescore
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  22. 2026-06-07 07:26 UTCEG score recompute
  23. 2026-06-06 13:47 UTCEPSS rescore
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  25. 2026-06-06 07:22 UTCEG score recompute
  26. 2026-06-05 22:47 UTCEPSS rescore
  27. 2026-06-05 07:18 UTCEG score recompute
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  30. 2026-06-04 13:12 UTCEPSS rescore
  31. 2026-06-04 13:12 UTCEPSS rescore
  32. 2026-06-04 07:14 UTCEG score recompute
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  35. 2026-06-02 07:06 UTCEG score recompute
  36. 2026-06-01 13:52 UTCEPSS rescore
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  39. 2026-05-31 22:30 UTCEPSS rescore
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  43. 2026-05-29 13:44 UTCEPSS rescore
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  45. 2026-05-28 13:44 UTCEPSS rescore
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  47. 2026-05-27 13:40 UTCEPSS rescore
  48. 2026-05-27 13:40 UTCEPSS rescore
  49. 2026-05-26 13:44 UTCEPSS rescore
  50. 2026-05-26 07:18 UTCEPSS rescore
  51. 2026-05-23 00:07 UTCEG score recompute
  52. 2026-05-21 22:43 UTCEPSS rescore
  53. 2026-05-20 22:38 UTCEPSS rescore
  54. 2026-05-20 13:14 UTCEG score recompute
  55. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-43894?
CVE-2026-43894 is a medium vulnerability published on May 11, 2026. jq is a command-line JSON processor. In 1.8.1 and earlier, when decNumberFromString is given a number literal of INT_MAX-1 (2147483646) digits, the D2U() macro overflows during signed-int arithmetic. The wrapped negative value bypasses the heap-allocation size check, causes the function to use a…
When was CVE-2026-43894 disclosed?
CVE-2026-43894 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43894 actively exploited?
CVE-2026-43894 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43894?
CVE-2026-43894 has a CVSS v3 base score of 6.2 (NVD).
How do I remediate CVE-2026-43894?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43894, 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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