| Name | CVE-2020-26950 |
| Description | In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2448-1, DLA-2449-1, DSA-4788-1, DSA-4790-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 120.0.1-1 | fixed |
| firefox-esr (PTS) | buster | 91.12.0esr-1~deb10u1 | fixed |
| buster (security) | 115.5.0esr-1~deb10u1 | fixed | |
| bullseye | 102.15.0esr-1~deb11u1 | fixed | |
| bullseye (security) | 115.5.0esr-1~deb11u1 | fixed | |
| bookworm, bookworm (security) | 115.5.0esr-1~deb12u1 | fixed | |
| sid, trixie | 115.5.0esr-1 | fixed | |
| thunderbird (PTS) | buster | 1:91.12.0-1~deb10u1 | fixed |
| buster (security) | 1:115.5.0-1~deb10u1 | fixed | |
| bullseye | 1:102.13.1-1~deb11u1 | fixed | |
| bullseye (security) | 1:115.5.0-1~deb11u1 | fixed | |
| bookworm, bookworm (security) | 1:115.5.0-1~deb12u1 | fixed | |
| trixie | 1:115.5.1-1 | fixed | |
| sid | 1:115.5.2-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | 82.0.3-1 | |||
| firefox-esr | source | stretch | 78.4.1esr-1~deb9u1 | DLA-2448-1 | ||
| firefox-esr | source | buster | 78.4.1esr-1~deb10u1 | DSA-4788-1 | ||
| firefox-esr | source | (unstable) | 78.4.1esr-1 | |||
| thunderbird | source | stretch | 1:78.4.2-1~deb9u1 | DLA-2449-1 | ||
| thunderbird | source | buster | 1:78.4.2-1~deb10u1 | DSA-4790-1 | ||
| thunderbird | source | (unstable) | 1:78.4.2-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2020-49/#CVE-2020-26950