cpp-httplib DoS: Negative chunk-size in chunked Transfer-Encoding
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| yhirose | cpp-httplib | affected |
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No data.
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| Yhirose | Cpp-httplib |
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No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.327% probability within 30 days)
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ssvc
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| CPEs | cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:* |
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| First Time appeared |
Yhirose
Yhirose cpp-httplib |
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| Vendors & Products |
Yhirose
Yhirose cpp-httplib |
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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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