CVE-2026-104432CWE-754

CVE-2026-104432

Medium · published October 2, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
22.0
In the wild
Unconfirmed
What it is

Zebra before 6.3.0 contains an improper exceptional condition check in ChainSync::obtain_tips that discards valid one-hash FindBlocks responses, falsely reporting close-to-tip status. Peers returning only the next block hash cause a zero-length sync sample, making the /ready endpoint return 200 OK while the node remains behind the tip.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
6.9 · 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
EPSS
0.00304 · 22.0th percentile
Weakness
CWE-754 · Improper Check for Unusual or Exceptional Conditions
Published
2026-10-02T16:17Z
References (2)
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h8m8-844p-v3m9 · [email protected]https://www.vulncheck.com/advisories/zebra-before-6.3.0-false-readiness-via-discarded-one-hash-findblocks-response · [email protected]
EPSS history
Timeline
  • 04 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 02 OCT 11:38Z
    Zebra before 6.3.0 False Readiness via Discarded One-Hash FindBlocks Response
    cvelistv5