HighFix available
libsdl1.2, libsdl2 — security advisory
There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution.
- Products
- libsdl1.2, libsdl2
- Affected versions
- Not specified
- Fixed versions
- 1.2.15+dfsg2-7, 2.0.20+dfsg-2
- CVEs
- CVE-2021-33657
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 00:23 UTC · Revision 1
Source evidence
There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution.
osv:DEBIAN-CVE-2021-33657
libsdl1.2
Fixed versions: 1.2.15+dfsg2-7
libsdl2
Fixed versions: 2.0.20+dfsg-2
libsdl2
Fixed versions: 2.0.20+dfsg-2
libsdl2
Fixed versions: 2.0.20+dfsg-2
Complete source record
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"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-33657",
"method": "structured",
"payload": {
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"title": "DEBIAN-CVE-2021-33657",
"summary": "There is a heap overflow problem in video/SDL_pixels.c in SDL (Simple DirectMedia Layer) 2.x to 2.0.18 versions. By crafting a malicious .BMP file, an attacker can cause the application using this library to crash, denial of service or Code execution.",
"evidence": "osv:DEBIAN-CVE-2021-33657",
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"modified": "2026-10-23T18:03:15.803593777Z",
"provider": "osv",
"upstream": [
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"references": [
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"evidence": "/upstream"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 420978,
"published_at": "2022-04-01T23:15:10.363+00:00"
}