Is CVE-2026-45352 actively exploited?

No active exploitation of CVE-2026-45352 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45352 be exploited remotely?

Yes. CVE-2026-45352 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-45352?

CVE-2026-45352 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-45352

CWE-20Published: May 29, 2026· Updated: Jun 2, 2026

7.5

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:18.3th

Official Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.43.4, negative chunk-size in chunked Transfer-Encoding causes unbounded memory allocation and process crash. The ChunkedDecoder::read_payload function in cpp-httplib (httplib.h) parses the chunk-size field of HTTP chunked transfer encoding using std::strtoul(). Per the C standard (§7.22.1.4), strtoul silently accepts a leading minus sign, performing unsigned wrap-around: strtoul("-2", …, 16) returns ULONG_MAX − 1 (0xFFFFFFFFFFFFFFFE). The library's only guard (line 12833) rejects ULONG_MAX (the result of "-1"), but any other negative value such as "-2" passes validation. The resulting near-maximum value is stored in chunk_remaining and controls how many bytes the server's read loop consumes from the network. This vulnerability is fixed in 0.43.4.

NVD Source

Technical Analysis

CVE-2026-45352 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.