| Name | CVE-2020-26974 |
| Description | When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6. |
| 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-2496-1, DLA-2497-1, DSA-4813-1, DSA-4815-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 132.0.2-1 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | fixed |
| bullseye (security) | 128.4.0esr-1~deb11u1 | fixed | |
| bookworm | 128.3.1esr-1~deb12u1 | fixed | |
| bookworm (security) | 128.4.0esr-1~deb12u1 | fixed | |
| sid, trixie | 128.4.0esr-1 | fixed | |
| thunderbird (PTS) | bullseye | 1:115.12.0-1~deb11u1 | fixed |
| bullseye (security) | 1:128.4.3esr-1~deb11u1 | fixed | |
| bookworm | 1:115.16.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 1:128.4.3esr-1~deb12u1 | fixed | |
| sid, trixie | 1:128.4.3esr-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) | 84.0-1 | |||
| firefox-esr | source | stretch | 78.6.0esr-1~deb9u1 | DLA-2496-1 | ||
| firefox-esr | source | buster | 78.6.0esr-1~deb10u1 | DSA-4813-1 | ||
| firefox-esr | source | (unstable) | 78.6.0esr-1 | |||
| thunderbird | source | stretch | 1:78.6.0-1~deb9u1 | DLA-2497-1 | ||
| thunderbird | source | buster | 1:78.6.0-1~deb10u1 | DSA-4815-1 | ||
| thunderbird | source | (unstable) | 1:78.6.0-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26974
https://www.mozilla.org/en-US/security/advisories/mfsa2020-55/#CVE-2020-26974
https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/#CVE-2020-26974