libsoup: A flaw was found in libsoup
CVE-2026-66337 is fixed in 10 products on 1 platform, first by ALAS2023-2026-3212, released November 7, 2026. It is not reported as exploited. Patch Radar priority: High.
A flaw was found in libsoup. An unsigned integer underflow in the soup_filter_input_stream_read_until() function causes a heap buffer over-read when parsing multipart HTTP responses. A malicious HTTP server can exploit this by sending a crafted multipart response, potentially causing the client application to crash or disclose sensitive heap memory.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libsoup · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-debuginfo · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-debugsource · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-devel · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup-doc · amzn 2023 | 2.72.0-6.amzn2023.0.16 | ALAS2023-2026-3212 | Nov 7, 2026 |
| libsoup3 · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-debuginfo · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-debugsource · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-devel · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
| libsoup3-doc · amzn 2023 | 3.7.3-1.amzn2023 | ALAS2023-2026-3240 | Nov 7, 2026 |
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