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curl < 7.84.0 supports "chained" HTTP compression algorithms meaning that a serverresponse can be compressed multiple times and potentially with different algorithms. The number of acceptable "links" in this "decompression chain" was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps.The use of such a decompression chain could result in a "malloc bomb" makingcurl end up spending enormous amounts of allocated heap memory or trying toand returning out of memory errors.

🗓️ 19 Jul 2022 07:00:00Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 4 Views

curl pre 7.84.0 allows chained compression, enabling unbounded decompression and memory exhaustion.

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microsoftcbl2_curl_7.84.0-1Range<7.84.0-1
microsoftcm1_curl_7.84.0-1Range<7.84.0-1

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21 Feb 2026 11:57Current
7.5High risk
Vulners AI Score7.5
CVSS 24.3
CVSS 3.16.5
EPSS0.3216
SSVC
curl versionscompression chainingmemory exhaustionunlimited decompression
4