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CVE-2026-110678— Cpanel::JSON::XS versions before 4.80 for Perl allow memory exhaustion by buffering incremental input past max_size in incr_parse

Quick assessment

Affected
CVE-2026-110678
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Perl 上的 Cpanel::JSON::XS 4.80 之前版本存在内存耗尽漏洞：在 函数中，若增量输入数据超过设定的 限制，攻击者可通过缓冲机制耗尽内存。 该解析器会将每个数据块追加到其缓冲区中。在标量或列表上下文中，它仅将 与解析进度进行比较，而非与缓冲区的实际长度比较。若某个数据块以 NUL 字节开头，解析器会在推进进度前停止解析；而在空上下文（void context）中调用时，该检查会被跳过，导致缓冲区无限制增长。 因此，任何向 消费者流式传输数据的对等方，均可无视 限制，耗尽目标进程的内存资源。

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 4.80 affected

I. Basic Information for CVE-2026-110678

Vulnerability Information
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Vulnerability Title
Cpanel::JSON::XS versions before 4.80 for Perl allow memory exhaustion by buffering incremental input past max_size in incr_parse
Source: CVE Program / CVE List V5
Vulnerability Description
Cpanel::JSON::XS versions before 4.80 for Perl allow memory exhaustion by buffering incremental input past max_size in incr_parse. The parser appends each chunk to its buffer. In scalar or list context, it compares max_size with how far it has progressed, not with the buffer length. A chunk that starts with a NUL byte stops the parser before it progresses, and a call in void context skips the check, so the buffer grows without limit. A peer streaming data to an incr_parse consumer can exhaust process memory regardless of max_size.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 4.80 -

II. Public POCs for CVE-2026-110678

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-110678

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Other References for CVE-2026-110678 (2)

IV. Related Vulnerabilities

Same weakness: CWE-770

V. Comments for CVE-2026-110678

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