Is CVE-2026-110678 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-110678 being exploited in the wild.

How severe is CVE-2026-110678?

Informational severity, published 19 October 2026.

Is there a fix for CVE-2026-110678?

Yes: fixed in 4.80. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-110678 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-110678?

Check whether you run Cpanel::JSON::XS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-110678: Cpanel::JSON::XS memory exhaustion in incr_parse

CVE-2026-110678 · Severity: info · Published 2026-10-19

Cpanel::JSON::XS is a Perl library for parsing JSON data. An attacker streaming JSON to an application using this library can exhaust process memory by sending specially crafted input that bypasses the memory limit (max_size) check, causing a denial of service.

Quick answers

Is CVE-2026-110678 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-110678 being exploited in the wild.
How severe is CVE-2026-110678?: Informational severity, published 19 October 2026.
Which products and versions are affected?: Cpanel::JSON::XS before 4.80.
Is there a fix for CVE-2026-110678?: Yes: fixed in 4.80. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-110678 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-110678?: Check whether you run Cpanel::JSON::XS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 4.80

Technical details

The incr_parse function in Cpanel::JSON::XS compares max_size against parser progress (incr_pos) rather than actual buffer length, allowing the internal buffer to grow without limit. Chunks starting with NUL bytes or calls in void context skip the check entirely. An attacker can send streaming JSON data to force unbounded memory buffering regardless of the max_size setting.

Affected products

Cpanel::JSON::XS before 4.80

Timeline

2026-10-19: disclosed

References

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