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CVE-2026-115866— Starlet versions from 0.20 before 0.33 for Perl allow CPU exhaustion via regular expression backtracking when decoding chunked request bodies

Quick assessment

Affected
CVE-2026-115866
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 Starlet 库在 0.20 至 0.33（不含）版本中存在漏洞：在解码分块（chunked）请求体时，攻击者可通过正则表达式回溯导致 CPU 资源耗尽。 具体而言，分块大小行被匹配为一段十六进制数字，后接 和 CRLF（回车换行）。然而，若该段数字后紧跟一个单独的 LF（换行），随后才是 CRLF，则永远无法匹配成功。此时，正则引擎会对每个数字重复尝试一次匹配，导致处理时间随数字序列长度的平方增长。由于该数字序列的长度未受限制，且可能跨越多次读取操作，因此极易引发性能问题。 远程攻击者仅需发送一

AI Predicted 7.5 Difficulty: Trivial

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None 0.20< 0.33 affected

I. Basic Information for CVE-2026-115866

Vulnerability Information
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Vulnerability Title
Starlet versions from 0.20 before 0.33 for Perl allow CPU exhaustion via regular expression backtracking when decoding chunked request bodies
Source: CVE Program / CVE List V5
Vulnerability Description
Starlet versions from 0.20 before 0.33 for Perl allow CPU exhaustion via regular expression backtracking when decoding chunked request bodies. A chunk-size line is matched as a run of hex digits, then .* and a CRLF. A run followed by a bare LF and then a CRLF can never match, and the engine retries the match once for each digit, so the time taken grows with the square of the run length. Nothing limits the length of the run, which can span several reads. A remote attacker can occupy a worker for about a minute of CPU time with one 128 KiB request, before the application is called.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0.20 ~ 0.33 -

II. Public POCs for CVE-2026-115866

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-115866

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Patches & Fixes for CVE-2026-115866 (1)

Vendor Pages for CVE-2026-115866 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1333