Vulnerability · CVE-2026-111959
Apache Arrow Rust: Improper validation of RunEndEncoded arrays allows out of bounds reads
Published Nov 2, 2026 · catalog updated Nov 5, 2026 · RustSec Rust
Last checked Nov 7, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-111959. EPSS is 0.55%. Act only if a listed version of RustSec Rust is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- RUSTSEC-2026-0455 · Unknown
- RUSTSEC-2026-0447 · Unknown
- RUSTSEC-2026-0443 · Unknown
- RUSTSEC-2026-0445 · Unknown
- RUSTSEC-2026-0446 · Unknown
- Severity
- Medium6.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.55%
- Remediation
- Advisory link
- Affected products
- crates.io arrow-data
Improper validation of RunEndEncoded arrays via can allow reading data beyond the bounds of the child values array when reading the last value via APIs such as . Patched versions now properly validate the contents of RunEndEncoded arrays to prevent allowing reading out of bounds of the specified array data. Credit to Adam Korczynski of Ada Logics for reporting this and Anthropic for finding this. (RUSTSEC-2026-0442)
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- crates.io arrow-data33.0.0 → 57.3.2
How to fix CVE-2026-111959
Upgrade
CVE-2026-111959 lists a fix boundary at 57.3.2. Compare the installed build with that boundary before you change production.
Version check
Seen in 33.0.0 → 57.3.2
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-111959. EPSS is 0.55%. Act only if a listed version of RustSec Rust is installed.
Which versions are affected?
Compare what you have installed with 33.0.0 → 57.3.2. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-125: Out-of-bounds Read. EPSS 0.55%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Nov 2, 2026 · Red Hat Security Data
Detected
arrow: arrow: Out-of-bounds read via improper validation of RunEndEncoded arrays
Nov 5, 2026 · GitHub Advisory Database
Fix available
arrow-data fixed in 57.3.2
Nov 5, 2026 · GitHub Advisory Database
Fix available
arrow-data fixed in 57.3.2
Nov 5, 2026 · GitHub Advisory Database
Updated
Improper validation of RunEndEncoded arrays via can allow reading data beyond the bounds of the child values array when reading the last value via APIs such as . Patched versions now properly validate the contents of RunEndEncoded arrays to prevent allowing reading out of bounds of the specified array data. Credit to Adam Korczynski of Ada Logics for reporting this and Anthropic for finding this.
Sources
- CVE.orgVulnerability recordCVE-2026-111959
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-111959
30-day exploitation probability 0.55%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-gqmm-qrjq-4c7h
GitHub Advisory Database record mirrored by OSV.
github.com - OpenSSF OSV / OSV ScannerPackage advisoryRUSTSEC-2026-0442
Apache Arrow Rust: Improper validation of RunEndEncoded arrays allows out of bounds reads
osv.dev - Red Hat Security DataVendor advisoryCVE-2026-111959
arrow: arrow: Out-of-bounds read via improper validation of RunEndEncoded arrays
access.redhat.com - RustSec Advisory DBVendor advisoryCVE-2026-111959
Improper validation of RunEndEncoded arrays via can allow reading data beyond the bounds of the child values array when reading the last value via APIs such as . Patched versions now properly validate the contents of RunEndEncoded arrays to prevent allowing reading out of bounds
crates.io
References
Freshness
Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 7, 2026
- RustSec Advisory DBNov 7, 2026
- GitHub Advisory DatabaseNov 6, 2026
- OpenSSF OSV / OSV ScannerNov 6, 2026
- CVE.orgNov 4, 2026
- Red Hat Security DataNov 3, 2026