snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server.
Metrics
Affected Vendors & Products
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History
Mon, 19 Oct 2026 16:30:00 +0000
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ssvc
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Mon, 19 Oct 2026 13:15:00 +0000
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Grunfink
Grunfink snac2 |
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Grunfink
Grunfink snac2 |
Sun, 18 Oct 2026 11:45:00 +0000
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| Description | snac2 before 2.93 contains a heap-based buffer overflow vulnerability in _xs_json_load_lexer() that allows unauthenticated remote attackers to corrupt heap memory by sending JSON strings containing a \u0000 escape. Attackers can send a single crafted application/activity+json POST to activitypub_post_handler(), which parses it before signature checks, overflowing heap allocations and crashing the server. | |
| Title | snac2 before 2.93 Heap-Based Buffer Overflow via JSON Parser _xs_json_load_lexer() | |
| Weaknesses | CWE-122 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-18T11:38:40.652Z
Updated: 2026-10-19T16:05:15.544Z
Reserved: 2026-10-18T01:24:56.329Z
Link: CVE-2026-112021
Updated: 2026-10-19T16:05:05.805Z
Status : Deferred
Published: 2026-10-18T12:17:15.200
Modified: 2026-10-19T21:14:14.150
Link: CVE-2026-112021
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