CVE-2019-12900 — BZ2_decompress in decompress

BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.

01What is this vulnerability?

BZ2_decompress in decompress.c in bzip2 through 1.0.6 has an out-of-bounds write when there are many selectors.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-06-19T23:15:09.910
• Last modified: 2026-10-14T07:16:45.443

09References

• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00040.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00050.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00078.html
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00000.html
• packetstormsecurity.com — http://packetstormsecurity.com/files/153644/Slackware-Security-Advisory-bzip2-Up…
• packetstormsecurity.com — http://packetstormsecurity.com/files/153957/FreeBSD-Security-Advisory-FreeBSD-SA…
• gitlab.com — https://gitlab.com/federicomenaquintero/bzip2/commit/74de1e2e6ffc9d51ef9824db71a…
• lists.apache.org — https://lists.apache.org/thread.html/ra0adb9653c7de9539b93cc8434143b655f753b9f60…
• lists.apache.org — https://lists.apache.org/thread.html/rce8cd8c30f60604b580ea01bebda8a671a25c9a162…
• lists.apache.org — https://lists.apache.org/thread.html/rda98305669476c4d90cc8527c4deda7e449019dd1f…