The HTTP/2 implementation in Mozilla Firefox before 43.0 allows remote attackers to cause a denial of service (integer underflow, assertion failure, and application exit) via a malformed PushPromise frame that triggers decompressed-buffer length miscalculation and incorrect memory allocation.

Buffer overflow in the nsDeque::GrowCapacity function in xpcom/glue/nsDeque.cpp in Mozilla Firefox before 43.0 might allow remote attackers to cause a denial of service or possibly have unspecified other impact by triggering a deque size change.

Integer underflow in the Metadata::setData function in MetaData.cpp in libstagefright in Mozilla Firefox before 43.0 and Firefox ESR 38.x before 38.5 allows remote attackers to execute arbitrary code or cause a denial of service (incorrect memory allocation and application crash) via an MP4 video file with crafted covr metadata that triggers a buffer overflow.

The gdk-pixbuf configuration in Mozilla Firefox before 43.0 on Linux GNOME platforms incorrectly enables the JasPer decoder, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted JPEG 2000 image.

Mozilla Firefox before 43.0 stores cookies containing vertical tab characters, which allows remote attackers to obtain sensitive information by reading HTTP Cookie headers.

Mozilla Firefox before 43.0 does not properly store the properties of unboxed objects, which allows remote attackers to execute arbitrary code via crafted JavaScript variable assignments.

Buffer overflow in the DirectWriteFontInfo::LoadFontFamilyData function in gfx/thebes/gfxDWriteFontList.cpp in Mozilla Firefox before 43.0 might allow remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted font-family name.

Mozilla Firefox before 43.0 mishandles the # (number sign) character in a data: URI, which allows remote attackers to spoof web sites via unspecified vectors.

Use-after-free vulnerability in Mozilla Firefox before 43.0 and Firefox ESR 38.x before 38.5 allows remote attackers to execute arbitrary code by triggering attempted use of a data channel that has been closed by a WebRTC function.

Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x before 38.5 might allow remote attackers to obtain sensitive information, cause a denial of service, or possibly have unspecified other impact by triggering a crafted WebRTC RTP packet.