CVE-2021-36089 json
Grok 7.6.6 through 9.2.0 has a heap-based buffer overflow in grk::FileFormatDecompress::apply_palette_clr (called from grk::FileFormatDecom…
published 2021-07-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-22722
- cvss
- 7.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 67%
- public exploits
- 0
- none known
Summary
Grok 7.6.6 through 9.2.0 has a heap-based buffer overflow in grk::FileFormatDecompress::apply_palette_clr (called from grk::FileFormatDecompress::applyColour).
Patch / fix
- libgrokj2k Debian 12 9.5.0-1
debian advisories DEBIAN-CVE-2021-36089
Exploit prediction
1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33544 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
bugs.chromium.org
/p/oss-fuzz/issues/detail?id=33544
exploit, issue-tracking, patch, third-party-advisory
-
github.com
/google/oss-fuzz-vulns/blob/main/vulns/grok/OSV-2021-677.yaml
third-party-advisory
-
github.com
/GrokImageCompression/grok/releases
release-notes, third-party-advisory
Sources
- CVE List CVE-2021-36089
- NVD CVE-2021-36089
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.