# CVE-2018-20847: openjpeg2: OpenJPEG is an open source library for reading and writing image files in JPEG2000 format. The following packages ha... CVE-2018-20847 is fixed in 4 products on 1 platform, first by RHSA-2021:4251, released November 9, 2021. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2018-20847 - Priority: High - CVSS: 8.8 (Moderate) - EPSS: 0.0234 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Nov 9, 2021 ## Description OpenJPEG is an open source library for reading and writing image files in JPEG2000 format. The following packages have been upgraded to a later upstream version: openjpeg2 (2.4.0). Security Fix(es): * openjpeg: use-after-free and double-free via a mix of valid and invalid files in a directory operated on by the decompressor (CVE-2020-15389) * openjpeg: heap-buffer-overflow in lib/openjp2/mqc.c could result in DoS (CVE-2020-27814) * openjpeg: heap-buffer-overflow write in opj_tcd_dc_level_shift_encode() (CVE-2020-27823) * openjpeg: heap-buffer-overflow in color.c may lead to DoS or arbitrary code execution (CVE-2021-3575) * openjpeg: integer overflow in opj_t1_encode_cblks in src/lib/openjp2/t1.c (CVE-2018-5727) * openjpeg: integer overflow in opj_j2k_setup_encoder function in openjp2/j2k.c (CVE-2018-5785) * openjpeg: division-by-zero in functions pi_next_pcrl, pi_next_cprl, and pi_next_rpcl in openmj2/pi.c (CVE-2018-20845) * openjpeg: integer overflow in function opj_get_encoding_parameters in openjp2/pi.c (CVE-2018-20847) * openjpeg: denial of service in function opj_t1_encode_cblks in openjp2/t1.c (CVE-2019-12973) * openjpeg: global-buffer-overflow read in opj_dwt_calc_explicit_stepsizes() (CVE-2020-27824) * openjpeg: null pointer dereference in opj_tgt_reset function in lib/openjp2/tgt.c (CVE-2020-27842) * openjpeg: out-of-bounds read in opj_t2_encode_packet function in openjp2/t2.c (CVE-2020-27843) * openjpeg: heap-based buffer overflow in functions opj_pi_next_rlcp, opj_pi_next_rpcl and opj_pi_next_lrcp in openjp2/pi.c (CVE-2020-27845) * openjpeg: out-of-bounds write due to an integer overflow in opj_compress.c (CVE-2021-29338) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.5 Release Notes linked from the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | openjpeg2 RHEL 8 | 0:2.4.0-4.el8 | [RHSA-2021:4251](https://patchblox.com/security/data/fix/linux/rhsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2 almalinux 8 | 2.4.0-4.el8 | [ALSA-2021:4251](https://patchblox.com/security/data/fix/linux/alsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2 ol 8 | 0:2.4.0-4.el8 | [ELSA-2021-4251](https://patchblox.com/security/data/fix/linux/elsa-2021-4251.md) | Nov 16, 2021 | | Linux | openjpeg2 rocky 8 | 0:2.4.0-4.el8 | [RLSA-2021:4251](https://patchblox.com/security/data/fix/linux/rlsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2-devel RHEL 8 | 0:2.4.0-4.el8 | [RHSA-2021:4251](https://patchblox.com/security/data/fix/linux/rhsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2-devel almalinux 8 | 2.4.0-4.el8 | [ALSA-2021:4251](https://patchblox.com/security/data/fix/linux/alsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2-devel ol 8 | 0:2.4.0-4.el8 | [ELSA-2021-4251](https://patchblox.com/security/data/fix/linux/elsa-2021-4251.md) | Nov 16, 2021 | | Linux | openjpeg2-devel-docs RHEL 8 | 0:2.4.0-4.el8 | [RHSA-2021:4251](https://patchblox.com/security/data/fix/linux/rhsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2-devel-docs almalinux 8 | 2.4.0-4.el8 | [ALSA-2021:4251](https://patchblox.com/security/data/fix/linux/alsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2-devel-docs ol 8 | 0:2.4.0-4.el8 | [ELSA-2021-4251](https://patchblox.com/security/data/fix/linux/elsa-2021-4251.md) | Nov 16, 2021 | | Linux | openjpeg2-tools RHEL 8 | 0:2.4.0-4.el8 | [RHSA-2021:4251](https://patchblox.com/security/data/fix/linux/rhsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2-tools almalinux 8 | 2.4.0-4.el8 | [ALSA-2021:4251](https://patchblox.com/security/data/fix/linux/alsa-2021-4251.md) | Nov 9, 2021 | | Linux | openjpeg2-tools ol 8 | 0:2.4.0-4.el8 | [ELSA-2021-4251](https://patchblox.com/security/data/fix/linux/elsa-2021-4251.md) | Nov 16, 2021 | --- Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo