UBUNTU-CVE-2026-120758

Dashboard / Vulnerabilities / UBUNTU-CVE-2026-120758

UBUNTU-CVE-2026-120758

Summary:

Details: HDF5 through 2.2.0 contains a NULL pointer dereference vulnerability in H5HL_unprotect() in src/H5HL.c. H5HL_protect() pins a single metadata cache entry for a local heap, either the heap prefix or the separate data block, and H5HL_unprotect() unpins it on the final unprotect. When the metadata cache destroys a corrupted local heap entry, H5HL__prfx_dest() unlinks it from the heap by setting heap->prfx or heap->dblk to NULL. A crafted HDF5 file can therefore reach H5HL_unprotect() with no cached object to unpin, and the function passes the NULL pointer to H5AC_unpin_entry(). This causes an assertion failure in debug builds and a NULL pointer dereference and crash in release builds. An attacker who can get a user or application to open and traverse a malicious file can cause a denial of service.

References: https://ubuntu.com/security/CVE-2026-120758, https://www.cve.org/CVERecord?id=CVE-2026-120758, https://github.com/HDFGroup/hdf5/issues/6403, https://github.com/HDFGroup/hdf5/pull/6377, https://github.com/HDFGroup/hdf5/commit/91fc37c3325264e67699408e3a190fe4f329bf85