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Tue, 02 Jun 2026 02:30:00 +0000
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ssvc
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Mon, 01 Jun 2026 18:45:00 +0000
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| CPEs | cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:* |
Fri, 29 May 2026 20:45:00 +0000
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Yhirose
Yhirose cpp-httplib |
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Yhirose
Yhirose cpp-httplib |
Fri, 29 May 2026 19:30:00 +0000
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| 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. | |
| Title | cpp-httplib DoS: Negative chunk-size in chunked Transfer-Encoding | |
| Weaknesses | CWE-1285 CWE-20 CWE-770 |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-02T01:52:12.106Z
Reserved: 2026-05-11T21:40:08.178Z
Link: CVE-2026-45352
Updated: 2026-06-02T01:52:05.190Z
Status : Modified
Published: 2026-05-29T20:16:26.140
Modified: 2026-06-02T03:16:17.560
Link: CVE-2026-45352
No data.
OpenCVE Enrichment
Updated: 2026-05-29T20:30:07Z