CVE-2026-61720 | BDVDB-2026-376705 Detail

Description#

FluidSynth is a software synthesizer based on the SoundFont 2 specifications. From 2.5.0 until 2.5.6, the SF2 parser computes the DMOD modulator count as chunk.size / SF_MOD_SIZE - 1 without rejecting chunks smaller than one record. A crafted SF2 file containing a zero-sized DMOD chunk makes the unsigned subtraction wrap to UINT_MAX, and the parser then attempts billions of SFMod allocations. This exhausts process memory and causes denial of service. No workaround is available. This issue is fixed in version 2.5.6.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-09-18Record published in the CVE List.
2. Version 22026-09-21Most recent update recorded in the CVE List.