Skip to main content
No exploitation reportedFix available

CVE-2026-14587

No exploitation reported by the sources we read.

  • Published2026-08-05
  • Fixed in2026.07.0 · 2026.7.0 · 5.26.29
  • WeaknessCWE-130

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Neo4j's Bolt modern handshake decoder treats an overlong capability bit mask the same way it treats a truncated bit mask. When an unauthenticated client sends a selected protocol version followed by 32 continuation bytes in the capability mask, the decoder resets the reader index and waits for more bytes instead of rejecting the protocol message and closing the channel. Because the same unread bytes remain at the front of the decoder buffer, appending a terminating byte later does not recover the connection. The decoder re-reads the same first 32 continuation bytes, returns without producing a handshake-finalization message, and leaves the channel open. This can be triggered before authentication by any client that can reach the Bolt connector.

Timeline

dates in UTC
  1. 2026-08-0517:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-14587?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-14587?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Neo4j
BranchAffectedFixed in
2026.7≥ 2025.01.0, < 2026.07.02026.07.0
2026.7≥ 2025.1.0, < 2026.7.02026.7.0
5.x≥ 5.0.0, < 5.26.295.26.29

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As Neo4j, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • neo4j Enterprise Editionother versions: not affected
    Affected
    • ≥ 2025.01, < 2026.07fixed in 2026.07date
    • ≥ 5.0, < 5.26.29fixed in 5.26.29semver
  • neo4j Community Editionother versions: not affected

    package neo4jhttps://mvnrepository.com/artifact/org.neo4j/

    Affected
    • ≥ 2025.01, < 2026.07fixed in 2026.07date
    • ≥ 5.0, < 5.26.29fixed in 5.26.29semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-05

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • neo4j-2025.06MinimOSall versions · no fixed version listedand 25 other packages
  • neo4j-2026.01Wolfiall versions · no fixed version listedand 2 other packages
  • neo4j-2026.01Chainguardall versions · no fixed version listedand 5 other packages
  • neo4j-5.26MinimOSall versions · fixed in 5.26.29-r0and 1 other package

Full record on NVD

Fix

  1. Update Neo4j to 2026.07.0 · 2026.7.0 · 5.26.29

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-08-05
Last Modified
2026-08-28
NVD status
Analyzed
GitHub Advisory
GHSA-cwvv-9488-x4h5

Frequently asked questions

What is CVE-2026-14587?

Neo4j's Bolt modern handshake decoder treats an overlong capability bit mask the same way it treats a truncated bit mask. When an unauthenticated client sends a selected protocol version followed by 32 continuation bytes in the capability mask, the decoder resets the reader index and waits for more bytes instead of rejecting the protocol message and closing the channel. Because the same unread bytes remain at the front of the decoder buffer, appending a terminating byte later does not recover the connection. The decoder re-reads the same first 32 continuation bytes, returns without producing a handshake-finalization message, and leaves the channel open. This can be triggered before authentication by any client that can reach the Bolt connector.

Is CVE-2026-14587 actively exploited?

Active exploitation of CVE-2026-14587 has not been confirmed. Its EPSS score was 0.5% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-14587?

CVE-2026-14587 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running neo4j? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record