CVE-2026-115943

UNRATEDCVSS · not yet scoredTrending — 6 sources updated this week

Also known asEUVD-2026-113403 (ENISA EUVD) · GHSA-h33r-pwjw-x33j (GitHub Security Advisories)Source: ENISA EUVD

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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS v2: —Exploit: None knownExposed services: Not assessed

Upgrade to Spreadsheet-XLSX 0.19 or later (from the CVE record's solution, CPAN Security Group) — apply it.

Spreadsheet::XLSX versions before 0.19 for Perl allow code execution via string eval of number format conditions in ExcelFmt.

When a number format has a condition such as [>100], ExcelFmt chooses the format section by passing the condition and the cell value to a string eval. Both come from the workbook, and the eval runs while Spreadsheet::XLSX->new parses it.

An attacker who supplies an XLSX file can run arbitrary Perl code.

CVSS v3
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EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
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EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-30). 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
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” 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

October 29, 2026

Last Modified

October 30, 2026

References (2)

Vendor Advisories for CVE-2026-115943(1)

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 17× in last 7d / 17× 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.

  1. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  2. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  3. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  4. 2026-10-30 19:48 UTCGHSA enrichmentGHSA-h33r-pwjw-x33j
  5. 2026-10-30 19:46 UTCNVD update
  6. 2026-10-30 18:30 UTCEG score recompute
  7. 2026-10-30 18:30 UTCGHSA enrichmentGHSA-h33r-pwjw-x33j
  8. 2026-10-30 18:29 UTCMITRE cvelistV5
  9. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  10. 2026-10-30 02:26 UTCGHSA enrichmentGHSA-h33r-pwjw-x33j
  11. 2026-10-30 02:26 UTCNVD update
  12. 2026-10-30 02:16 UTCGHSA enrichmentGHSA-h33r-pwjw-x33j
  13. 2026-10-30 02:15 UTCMITRE cvelistV5
  14. 2026-10-29 22:26 UTCNVD update
  15. 2026-10-29 22:02 UTCENISA EUVD ID recordedEUVD-2026-113403 · Source: ENISA EUVD
  16. 2026-10-29 21:45 UTCEG score recompute
  17. 2026-10-29 21:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-115943?
CVE-2026-115943 is a vulnerability whose severity is not yet rated; its CVE record was published on October 29, 2026. Spreadsheet::XLSX versions before 0.19 for Perl allow code execution via string eval of number format conditions in ExcelFmt. When a number format has a condition such as [>100], ExcelFmt chooses the format section by passing the condition and the cell value to a string eval. Both come from the…
When was the CVE record for CVE-2026-115943 published?
The CVE record for CVE-2026-115943 was published on October 29, 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 October 30, 2026; the record at its source may have been updated since.
Is CVE-2026-115943 actively exploited?
CVE-2026-115943 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-115943?
The CVE record's solution for CVE-2026-115943, written by its CNA CPAN Security Group, names the fix: "Upgrade to Spreadsheet-XLSX 0.19 or later." The vendor advisories EchelonGraph has for CVE-2026-115943 are linked in the Vendor Advisories panel on this page.

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