| Name | CVE-2021-20270 |
| Description | An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword. |
| 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-2590-1, DLA-2648-1, DSA-4870-1, DSA-4889-1 |
| Debian Bugs | 984664 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| mediawiki (PTS) | buster | 1:1.31.16-1+deb10u2 | fixed |
| buster (security) | 1:1.31.16-1+deb10u7 | fixed | |
| bullseye | 1:1.35.13-1~deb11u1 | fixed | |
| bullseye (security) | 1:1.35.13-1+deb11u2 | fixed | |
| bookworm | 1:1.39.5-1~deb12u1 | fixed | |
| bookworm (security) | 1:1.39.7-1~deb12u1 | fixed | |
| sid, trixie | 1:1.39.7-1 | fixed | |
| pygments (PTS) | buster, buster (security) | 2.3.1+dfsg-1+deb10u2 | fixed |
| bullseye | 2.7.1+dfsg-2.1 | fixed | |
| bookworm | 2.14.0+dfsg-1 | fixed | |
| sid, trixie | 2.17.2+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| mediawiki | source | stretch | 1:1.27.7-1~deb9u8 | DLA-2648-1 | ||
| mediawiki | source | buster | 1:1.31.14-1~deb10u1 | DSA-4889-1 | ||
| mediawiki | source | (unstable) | 1:1.35.2-1 | |||
| pygments | source | stretch | 2.2.0+dfsg-1+deb9u1 | DLA-2590-1 | ||
| pygments | source | buster | 2.3.1+dfsg-1+deb10u1 | DSA-4870-1 | ||
| pygments | source | (unstable) | 2.7.1+dfsg-2 | 984664 |
https://github.com/pygments/pygments/issues/1625
https://github.com/pygments/pygments/commit/f91804ff4772e3ab41f46e28d370f57898700333