How severe is CVE-2026-44500?

CVE-2026-44500 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-44500 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44500?

CVE-2026-44500 primarily affects Zfnd Zebra-chain. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-44500?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44500 have an EU (EUVD) identifier?

Yes. CVE-2026-44500 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28784.

When was CVE-2026-44500 published?

CVE-2026-44500 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2026-44500

CVE-2026-44500 is a medium-severity vulnerability in Zfnd Zebra-chain with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28784
Weakness: CWE-770
Affected product: Zfnd Zebra-chain
Published: 2026-05-08
Last modified: 2026-06-17

Description

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Zebra allocated buffers sized against generic transport or block-size ceilings before the tighter protocol or consensus limits were enforced. An unauthenticated or post-handshake peer could therefore force the node to preallocate and parse for orders of magnitude more data than the protocol intended, across headers messages, equihash solutions in block headers, Sapling spend vectors in V5/V4 transactions, and coinbase script bytes in blocks. This issue has been patched in zebrad version 4.4.0, zebra-chain version 7.0.0, and zebra-network version 6.0.0.

Frequently asked questions

What is CVE-2026-44500?: ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Zebra allocated buffers sized against generic transport or block-size ceilings before the tighter protocol or consensus limits were enforced. An unauthenticated or post-handshake peer could therefore force the node to preallocate and parse for orders of magnitude more data than the protocol intended, across headers messages, equihash solutions in block headers, Sapling spend vectors in V5/V4 transactions, and coinbase script bytes in blocks. This issue has been patched in zebrad version 4.4.0, zebra-chain version 7.0.0, and zebra-network version 6.0.0.
How severe is CVE-2026-44500?: CVE-2026-44500 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-44500 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44500?: CVE-2026-44500 primarily affects Zfnd Zebra-chain. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-44500?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44500 have an EU (EUVD) identifier?: Yes. CVE-2026-44500 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28784.
When was CVE-2026-44500 published?: CVE-2026-44500 was published on 2026-05-08 and last updated on 2026-06-17.

References

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-438q-jx8f-cccv

Affected products (3)

cpe:2.3:a:zfnd:zebra-chain:*:*:*:*:*:rust:*:*
cpe:2.3:a:zfnd:zebra-network:*:*:*:*:*:rust:*:*
cpe:2.3:a:zfnd:zebrad:*:*:*:*:*:rust:*:*

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